Added Github Actions badge

Author: seanlaw

.github/workflows/github-actions.yml

@@ -1,5 +1,9 @@
-name: github-actions
-on: [push, pull_request]
+name: Tests
+on:
+  push:
+    branches: master
+  pull_request:
+    branches: master
 jobs:
   unit-testing:
     runs-on: ${{ matrix.os }}
@@ -56,4 +60,4 @@ jobs:
         run: ./test.sh coverage
         shell: bash
       - name: Upload Coverage Tests Results
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v1

README.rst

@@ -16,6 +16,9 @@
 .. image:: https://dev.azure.com/stumpy-dev/stumpy/_apis/build/status/TDAmeritrade.stumpy?branchName=master
     :target: https://dev.azure.com/stumpy-dev/stumpy/_build/latest?definitionId=2&branchName=master
     :alt: Build Status
+.. image:: https://github.com/TDAmeritrade/stumpy/workflows/Tests/badge.svg
+    :target https://github.com/TDAmeritrade/stumpy/actions?query=workflow%3ATests+branch%3Amaster)
+    :alt: Test Status
 .. image:: https://readthedocs.org/projects/stumpy/badge/?version=latest
     :target: https://stumpy.readthedocs.io/
     :alt: ReadTheDocs Status