Bump spinach from 0.2 to 0.3 in /examples (#1032)

Bumps [spinach](https://github.com/mp911de/spinach) from 0.2 to 0.3.
<details>
<summary>Release notes</summary>

*Sourced from [spinach's releases](https://github.com/mp911de/spinach/releases).*

> ## 0.3
> ## SocketAddressSupplier API
> 
> The SocketAddressSupplier API allows to control the used
> connection points/SocketAddresses for initial connection and reconnection.
> The use case for controlling the source and sequence of
> connection points are failover and cluster node discovery.
> 
> The API exposes a factory for `SocketAddressSupplier`s which accepts
> a `RedisURI`. By default, multiple addresses are utilized in with RoundRobin.
> 
> The predefined methods can be found in the `SocketAddressSupplierFactory.Factories` enum:
> - `ROUND_ROBIN`: Cyclic use of multiple addresses specified by the `RedisURI`
> - `HELLO_CLUSTER`: Uses `ROUND_ROBIN` for the initial connect. Once a connection is
>   established the mechanism obtains the cluster nodes using the `HELLO`
>   command _AT STARTUP_. Periodical scheduling/updating is currently not implemented.
>   This can be however achieved by implementing an own factory
>   that calls the `reloadNodes()` method periodically/on demand.
> 
> New mechanisms can be implemented by implementing the
> `SocketAddressSupplier`/`SocketAddressSupplierFactory` interfaces.
> 
> Submit your mechanism by opening a Pull-Request if you want to contribute to spinach.
> 
> ```
> DisqueClient client = new DisqueClient();
> 
> DisqueConnection<String, String> connection = client.connect(new Utf8StringCodec(), disqueURI,
>                 SocketAddressSupplierFactory.Factories.ROUND_ROBIN);
> 
> 
> DisqueConnection<String, String> connection = client.connect(new Utf8StringCodec(), disqueURI,
>                 SocketAddressSupplierFactory.Factories.HELLO_CLUSTER);
> ```
> 
> ## QueueListener API
> 
> Spinach allows a push pattern to obtain jobs from Disque. The QueueListener API
> introduces a listener/notification style by utilizing rx-java Observables.
> The QueueListener API exposes an `Observable<Job>` that emits jobs.
> The jobs can be processed asynchronously by applying transformations
> or `doOnNext` steps. Each `Observable<Job>` allocates at the time
> of subscription resources. The resources are released when unsubscribing
> from the subscription.
> 
> ```
> QueueListenerFactory<String, String> queueListenerFactory = QueueListenerFactory.create(disqueURI,
>             new Utf8StringCodec(), "queue");  // 1
> 
> Observable<Job<String, String>> getjobs = queueListenerFactory.getjobs(); // 2
></table> ... (truncated)
</details>
<details>
<summary>Changelog</summary>

*Sourced from [spinach's changelog](https://github.com/mp911de/spinach/blob/master/RELEASE-NOTES.md).*

>               spinach 0.3 RELEASE NOTES
> 
> 
> SocketAddressSupplier API
> -------------------------
> 
> The SocketAddressSupplier API allows to control the used
> connection points/SocketAddresses for initial connection and reconnection.
> The use case for controlling the source and sequence of
> connection points are failover and cluster node discovery.
> 
> The API exposes a factory for `SocketAddressSupplier`s which accepts
> a `RedisURI`. By default, multiple addresses are utilized in with RoundRobin.
> 
> The predefined methods can be found in the `SocketAddressSupplierFactory.Factories` enum:
> 
> * `ROUND_ROBIN`: Cyclic use of multiple addresses specified by the `RedisURI`
> * `HELLO_CLUSTER`: Uses `ROUND_ROBIN` for the initial connect. Once a connection is
>    established the mechanism obtains the cluster nodes using the `HELLO`
>    command *AT STARTUP*. Periodical scheduling/updating is currently not implemented.
>    This can be however achieved by implementing an own factory
>    that calls the `reloadNodes()` method periodically/on demand.
> 
> New mechanisms can be implemented by implementing the
> `SocketAddressSupplier`/`SocketAddressSupplierFactory` interfaces.
> 
> Submit your mechanism by opening a Pull-Request if you want to contribute to spinach.
> 
> 
> ```
> DisqueClient client = new DisqueClient();
> 
> DisqueConnection<String, String> connection = client.connect(new Utf8StringCodec(), disqueURI,
>                 SocketAddressSupplierFactory.Factories.ROUND_ROBIN);
> 
> 
> DisqueConnection<String, String> connection = client.connect(new Utf8StringCodec(), disqueURI,
>                 SocketAddressSupplierFactory.Factories.HELLO_CLUSTER);
> ```
> 
> QueueListener API
> -----------------
> 
> Spinach allows a push pattern to obtain jobs from Disque. The QueueListener API
> introduces a listener/notification style by utilizing rx-java Observables.
> The QueueListener API exposes an `Observable<Job>` that emits jobs.
> The jobs can be processed asynchronously by applying transformations
> or `doOnNext` steps. Each `Observable<Job>` allocates at the time
> of subscription resources. The resources are released when unsubscribing
> from the subscription.
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`0b02fbc`](mp911de/spinach@0b02fbc) [maven-release-plugin] prepare release 0.3
- [`1608d33`](mp911de/spinach@1608d33) Improve test stability
- [`af07f39`](mp911de/spinach@af07f39) Fix site name and copies
- [`f3467b7`](mp911de/spinach@f3467b7) Prepare release
- [`e61d5cb`](mp911de/spinach@e61d5cb) Upgrade netty to 4.0.34.Final, use lettuce 3.4.1 release instead of snapshot
- [`da1a9eb`](mp911de/spinach@da1a9eb) Update release notes
- [`0574f58`](mp911de/spinach@0574f58) Add factory methods and client resources, upgrade to lettuce 3.4
- [`cee5bdb`](mp911de/spinach@cee5bdb) Fix addjob documentation about timeout/TTL [#21](https://github-redirect.dependabot.com/mp911de/spinach/issues/21)
- [`e0932b8`](mp911de/spinach@e0932b8) Polishing
- [`80542ad`](mp911de/spinach@80542ad) Implement QSTAT command [#20](https://github-redirect.dependabot.com/mp911de/spinach/issues/20)
- Additional commits viewable in [compare view](mp911de/spinach@0.2...0.3)
</details>
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</details>

examples/disque-job-queue/pom.xml

@@ -14,7 +14,7 @@
         <dependency>
             <groupId>biz.paluch.redis</groupId>
             <artifactId>spinach</artifactId>
-            <version>0.2</version>
+            <version>0.3</version>
         </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>