Added PyPy 3.7 tests

.woodpecker.yml

@@ -23,6 +23,14 @@ pipeline:
             - pip install -e .[ci]
             - tox -e py37
 
+    test-3.7-pypy:
+        group: test
+        image: pypy:3-7-slim
+        pull: true
+        commands:
+            - pip install -e .[ci]
+            - tex -e pypy37
+
     test-3.6:
         group: test
         image: python:3.6-alpine

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py36,py37,py38,py39,lint
+envlist = py36,py37,pypy37,py38,py39,lint
 
 [testenv]
 deps = .[test]