Merge pull request #183 from mixpanel/jt-6-1-2

bump version to 6.1.2

Merge pull request #177 from mixpanel/jt-version-6-1-1

Bump version to 6.1.1

6.1.0

6.0.0

5.13.0

add eventing and internal tracking for various performance timings

5.9.0

5.7.0