Update RF 3.2.1 in CI

Author: aaltat

.github/workflows/CI.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         python-version: [2.7, 3.6, 3.8, pypy3]
-        rf-version: [3.1.2, 3.2]
+        rf-version: [3.1.2, 3.2.1]
 
     steps:
     - uses: actions/checkout@v2