Encoding failure with non-ASCII characters for git_info (author name, ...)

[IchordeDionysos]

Got this well known encoding issue (#2, #13), but this time not for the sources files, but for the git_info :D

One author name on our team has a German special character in his name ü, which is fairly common in Germany.

So we get this error for all his PRs :)

/usr/local/lib/ruby/gems/2.5.0/gems/coveralls-lcov-1.6.0/lib/coveralls/lcov/runner.rb:106:in `encode': "\xC3" on US-ASCII (Encoding::InvalidByteSequenceError)
	from /usr/local/lib/ruby/gems/2.5.0/gems/coveralls-lcov-1.6.0/lib/coveralls/lcov/runner.rb:106:in `to_json'
	from /usr/local/lib/ruby/gems/2.5.0/gems/coveralls-lcov-1.6.0/lib/coveralls/lcov/runner.rb:106:in `run'
	from /usr/local/lib/ruby/gems/2.5.0/gems/coveralls-lcov-1.6.0/bin/coveralls-lcov:5:in `<top (required)>'
	from /usr/local/bin/coveralls-lcov:23:in `load'
	from /usr/local/bin/coveralls-lcov:23:in `<main>'

From looking at the PR changes, branch name, and git log I am fairly certain, that in our case it's related to these lines:
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L22
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L97

But those lines might also become a potential problem:
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L94
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L96
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L98
https://github.com/okkez/coveralls-lcov/blob/master/lib/coveralls/lcov/converter.rb#L101

I am not very familiar with Ruby, but it looks like such a solution might help here:
https://stackoverflow.com/questions/263271/converting-utf8-to-ansi-with-ruby

[okkez]

Sorry for being late.
I could not represent the issue on my local environment.

Please run following script to show me your environment:

p RUBY_VERSION
p Encoding.default_external
p Encoding.default_internal
p ENV["LANG"]
author_name = `git log -1 --format=%aN`
p author_name
p author_name.encoding
p author_name.codepoints