fix issue where churn output isn't captured on error which leads to metric fu crashing opposed to just empty churn reports. Churn requires one of 4 source control systems to exists but it can be safely left out of the report on that error. It will print error to concole when running to alert users to the issue
updating history file
Merge pull request #67 from danmayer/fix_churn_crash_on_no_source_control_system_found

fix issue where churn output isn't captured on error which leads to metr...