Fix coverage config

sirosen · sirosen · commit 51126b57b87d · 2021-01-26T17:59:09.000Z
source overrides include.
There doesn't appear to be a reason to prefer either once, so use
`include` as it sticks with the same file-oriented syntax as `omit`.
diff --git a/.coveragerc b/.coveragerc
@@ -1,7 +1,6 @@
 [run]
 branch = True
 omit = nose2/tests/*
-source = nose2
 include = nose2/*
 
 [report]
