Problem with non-ASCII character in folder name

[dknx01]

There seems to be a problem when you have a non-ascii letter in the folder name.

I had a folder with an "ö" inside an got this error.

pronto run -f gitlab -r phpcs -c origin/master
/usr/lib/ruby/2.1.0/json/common.rb:155:in `encode': "\xC3" on US-ASCII (Encoding::InvalidByteSequenceError)
    from /usr/lib/ruby/2.1.0/json/common.rb:155:in `initialize'
    from /usr/lib/ruby/2.1.0/json/common.rb:155:in `new'
    from /usr/lib/ruby/2.1.0/json/common.rb:155:in `parse'
    from /var/lib/gems/2.1.0/gems/pronto-phpcs-0.2.0/lib/pronto/phpcs.rb:39:in `run_phpcs'
    from /var/lib/gems/2.1.0/gems/pronto-phpcs-0.2.0/lib/pronto/phpcs.rb:28:in `inspect'
    from /var/lib/gems/2.1.0/gems/pronto-phpcs-0.2.0/lib/pronto/phpcs.rb:18:in `block in run'
    from /var/lib/gems/2.1.0/gems/pronto-phpcs-0.2.0/lib/pronto/phpcs.rb:18:in `map'
    from /var/lib/gems/2.1.0/gems/pronto-phpcs-0.2.0/lib/pronto/phpcs.rb:18:in `run'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/runners.rb:20:in `block in run'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/runners.rb:13:in `each'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/runners.rb:13:in `run'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto.rb:56:in `run'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/cli.rb:54:in `block in run'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/cli.rb:53:in `chdir'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/lib/pronto/cli.rb:53:in `run'
    from /var/lib/gems/2.1.0/gems/thor-0.19.4/lib/thor/command.rb:27:in `run'
    from /var/lib/gems/2.1.0/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command'
    from /var/lib/gems/2.1.0/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch'
    from /var/lib/gems/2.1.0/gems/thor-0.19.4/lib/thor/base.rb:444:in `start'
    from /var/lib/gems/2.1.0/gems/pronto-0.8.2/bin/pronto:6:in `<top (required)>'
    from /usr/local/bin/pronto:23:in `load'
    from /usr/local/bin/pronto:23:in `<main>'
ERROR: Job failed: exit code 1