0.4.0 Release Candidate 1

WARNING: THIS IS A RELEASE CANDIDATE AND IS NOT INTENDED FOR DOWNSTREAM USE.

This source is a candidate for release version. Please see #409 issue for testing instructions and where to leave your feedback.

Compared to the previous (0.3.1) release, this candidate includes

• #392 - Separate HBase v0.9x and v1.x bindings.
• #371 - Make hdrhistogram default measurement type.
• #327 - Race condition between insert and read/update operations. (via PR #364)

Of particular note is that #371 introduces two incompatibilities with previous releases:

• ❗ Default measurement changed from histogram to hdrhistogram Users who want previous behavior can set the 'measurementtype' property to 'histogram'
• ❗ Reported 95th and 99th percentile latencies now in microseconds (previously in milliseconds)