RasterStats: Process values equal to min_coverage_frac

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.76%. Comparing base (2cb8c96) to head (efb61f4). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #132 +/- ## ========================================== + Coverage 90.74% 90.76% +0.02% ========================================== Files 85 85 Lines 6179 6196 +17 Branches 612 614 +2 ========================================== + Hits 5607 5624 +17 Misses 540 540 Partials 32 32 ```

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