Updated Python 3 version use by Python Package GitHub action

Author: tpoveda

Diff for: .github/workflows/pythonpackage.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7.18, 3.5.9]
+        python-version: [2.7.18, 3.5.10]
 
     steps:
     - uses: actions/checkout@v2