Update python-package.yml (#290)

Author: Tom Osowski

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [pypy2, pypy3, 3.5, 3.6, 3.7]
+        python-version: [pypy-3.7, 3.5, 3.6, 3.7]
         os: [macos-latest, ubuntu-latest]
 
     steps: