Autocorrect Style/Encoding go in an infinite loop

[ptitpoulpe]

If you have a file starting with a blank line like this:

<blank line>
module Toto
end

and try to autocorrect with Style/Encoding it start an infinite loop
where it add # encoding: utf-8 on the second line, giving something
like this:

<blank line>
# encoding: utf-8
# encoding: utf-8
...
module Toto
end

[alexdowad]

Nice catch! I'm looking at the reason for this right now.

[alexdowad]

Just coding up a fix.

[alexdowad]

Waiting until my open PR is merged to push this one.