Require rubycritic/version in JSON::Simple generator
Require rubycritic/version in JSON::Simple generator

This is usually required in Rubycritic::RevisionComparator, but that it
not always loaded (example: using --mode-ci).

Fix #53

whitesmith/rubycritic,whitesmith/rubycritic,bglusman/rubycritic,bglusman/rubycritic,bglusman/rubycritic,whitesmith/rubycritic,whitesmith/rubycritic