churn integration seems to be broken on v4.13

[etagwerker]

Tested metric_fu on this simple Ruby on Rails app: https://github.com/fastruby/pecas

Tested with both metric_fu . and metric_fu app and this is the output I got in the console:

metric_fu app
/Users/etagwerker/.rvm/gems/ruby-2.5.8@pecas/gems/metric_fu-4.13.0/lib/metric_fu/cli/parser.rb:69: warning: constant ::Fixnum is deprecated
******* STARTING METRIC churn
churn: ignoring invalid regex: empty char-class: /[]/
churn: ignoring invalid regex: empty char-class: /[]/
churn: ignoring invalid regex: empty char-class: /[]/
churn: ignoring invalid regex: empty char-class: /[]/
******* ENDING METRIC churn

This is what the report looks like:

Clearly there is information missing in there.