[Fix #1566] Don't convert line endings on Windows when autocorrecting

When autocorrecting, the changed portions of code will use "\n" line endings,
rather than "\r\n". Everything else will remain as it was.

CHANGELOG.md

@@ -69,6 +69,7 @@
 * [#947](https://github.com/bbatsov/rubocop/issues/947): `Style/Documentation` considers classes and modules which only define constants to be "namespaces", and doesn't flag them for lack of a documentation comment. ([@alexdowad][])
 * [#2467](https://github.com/bbatsov/rubocop/issues/2467): Explicitly inheriting configuration from the rubocop gem in .rubocop.yml is not allowed. ([@alexdowad][])
 * [#2322](https://github.com/bbatsov/rubocop/issues/2322): Output of --auto-gen-config shows content of default config parameters which are Arrays; this is especially useful for SupportedStyles. ([@alexdowad][])
+* [#1566](https://github.com/bbatsov/rubocop/issues/1566): When autocorrecting on Windows, line endings are not converted to "\r\n" in untouched portions of the source files; corrected portions may use "\n" rather than "\r\n". ([@alexdowad][])
 
 ## 0.35.1 (10/11/2015)
 

lib/rubocop/cop/team.rb

@@ -72,7 +72,7 @@ def autocorrect(buffer, cops)
           @options[:stdin] = new_source
         else
           filename = buffer.name
-          File.open(filename, 'w') { |f| f.write(new_source) }
+          File.open(filename, 'wb') { |f| f.write(new_source) }
         end
         @updated_source_file = true
       end