Bump version to 0.7.7

[nhz2]

diff: v0.7.6...aa46ccd

This release bumps julia compat to v1.6.

It also adds a new ZlibError type. Ref #93

Lastly, the windowbits option now must be in 9:15 when compressing. Ref #60

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.51%. Comparing base (aa46ccd) to head (59a2431).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   83.51%   83.51%           
=======================================
  Files           4        4           
  Lines         188      188           
=======================================
  Hits          157      157           
  Misses         31       31           

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