Update python versions for CI (#96)

* Drop Python 3.4 - GitHub reports it as not found, despite it being in the list it links to!?!?!?
* Fix Coveralls

Author: Gadgetoid

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [2.7, 3.4, 3.5, 3.7, 3.8]
+        python: [2.7, 3.5, 3.6, 3.7, 3.8]
 
     steps:
       - uses: actions/checkout@v2
@@ -32,6 +32,6 @@ jobs:
         working-directory: library
         run: |
           python -m pip install coveralls
-          coveralls
+          coveralls --service=github
         if: ${{ matrix.python == '3.8' }}