For a 0.8.9 release

[ablaom]

#229

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.44%. Comparing base (cca89bd) to head (59b49bc).
⚠️ Report is 49 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plotrecipes.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   87.85%   87.44%   -0.42%     
==========================================
  Files          13       13              
  Lines         667      677      +10     
==========================================
+ Hits          586      592       +6     
- Misses         81       85       +4     

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