Improve xplat/ktfmt/bump_version.sh to only commit pom.xml files
Improve xplat/ktfmt/bump_version.sh to only commit pom.xml files

Summary: ... and not the script itself, which has to be changed before it's run.

Reviewed By: strulovich

Differential Revision: D22571650

fbshipit-source-id: db70197e7ed0f2bbb55d4fa140d405d3e5c68445

facebookincubator/ktfmt,facebookincubator/ktfmt,facebookincubator/ktfmt,facebookincubator/ktfmt,facebookincubator/ktfmt