Enforce coverage percentage

l0b0 · l0b0 · commit a00a61aa6d87 · 2021-05-27T12:13:31.000+12:00
Avoids merging in PRs which decrease coverage substantially, while
encouraging bumping the number when coverage increases.
diff --git a/.coveragerc b/.coveragerc
@@ -1,2 +1,5 @@
+[report]
+fail_under = 89
+
 [run]
 source = pystac
