fix docs deploy to only push on master

.github/workflows/deploy-docs.yml

@@ -1,23 +1,23 @@
 name: Build Documentation using MkDocs
-on: 
+on:
-  push: 
+  push:
-    branches: [master]
+    branches: [ master ]
-jobs: 
+jobs:
-  build: 
+  build:
-    name: Build and Deploy Documentation 
+    name: Build and Deploy Documentation
-    runs-on: ubuntu-latest 
+    runs-on: ubuntu-latest
-    steps: 
+    steps:
-      - name: Checkout Master 
+      - name: Checkout Master
-        uses: actions/checkout@v2 
+        uses: actions/checkout@v2
-      - name: Set up Python 3.7 
+      - name: Set up Python 3.7
-        uses: actions/setup-python@v2 
+        uses: actions/setup-python@v2
-        with: 
+        with:
-          python-version: '3.x' 
+          python-version: '3.x'
-      - name: Install dependencies 
+      - name: Install dependencies
-        run: | 
+        run: |
           python -m pip install --upgrade pip 
           pip install mkdocs-material 
-      - name: Deploy 
+      - name: Deploy
-        run: | 
+        run: |
           git pull origin master
           mkdocs gh-deploy