Fixing a typo in a Diff command switch "summarize"

It was "summarize" before 58b842618bcff1a0d851540431d5f318fdd443b2
Merge pull request #12 from mhujer/fix-typo-in-diff

Fixing a typo in a Diff command switch "summarize"
Bug #19776 - escape arguments to prevent injection
Update package.xml for next release
Added 'parents' switch support for 'update' command
Merge pull request #13 from sbesedkov/master

Added 'parents' switch support for 'update' command