Merge pull request DataDog#25 from DataDog/stephenf/add-runtime-and-m…

…emorysize-tags

Tag enhanced metrics with runtime and memorysize

Merge pull request DataDog#24 from DataDog/stephenf/update-changelog-v8

Bump version to v8 and update changelog

Merge pull request DataDog#19 from DataDog/swf/submit-invocations-errors

Submit metrics for invocations and errors

Merge pull request DataDog#16 from DataDog/tian.chu/bump-version-to-6

Bump version to 6

Update changelog

Bump version/Changelog

Merge pull request DataDog#5 from DataDog/compact-log-fmt-for-metric

Shorten the metric log keys

Flush metrics to log

Version 1