bumps version to 3.10.0-SNAPSHOT

[raleigh-g-thompson]

closes #582

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.77%. Comparing base (111bda0) to head (1a1dd6d).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #583   +/-   ##
=========================================
  Coverage     19.76%   19.77%           
- Complexity     1644     1645    +1     
=========================================
  Files           310      310           
  Lines         27283    27283           
  Branches       4317     4317           
=========================================
+ Hits           5393     5395    +2     
+ Misses        20997    20996    -1     
+ Partials        893      892    -1     

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