rm pypy test

Author: ulf1

.github/workflows/syntax-and-unit-tests.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.x', 'pypy3']
+        python-version: ['3.6', '3.7', '3.8', '3.x']
 
     name: Python ${{ matrix.python-version }} Tests