Prepare release v0.71.0 (signalfx#679)

* Prepare release v0.71.0

* Update CHANGELOG.md

Release 0.70.0 (signalfx#653)

release 0.68.0 (signalfx#640)

Release 0.67.0 (signalfx#612)

prepare 0.66.1 release (signalfx#602)

release-v0.62.1, this release was a one off patch fix release to appl…

…y a fix to an older version of this chart

prepare release 0.66.0 (signalfx#593)

prepare release 0.64.0 (signalfx#589)

Release 0.62.2 (signalfx#583)

prepare release 0.62.1 (signalfx#574)