fixup: package checks

Author: cjw296

.circleci/config.yml

@@ -58,12 +58,6 @@ common: &common
           branches:
             only: master
 
-    - check-package:
-        name: check-package-python27
-        image: circleci/python:3.7
-        requires:
-          - package
-
     - check-package:
         name: check-package-python37
         image: circleci/python:3.7
@@ -78,7 +72,7 @@ common: &common
 
     - check-package:
         name: check-package-pypy36
-        image: pypy:2.7
+        image: pypy:3.6
         python: pypy
         requires:
           - package