Use v1 in actions example

Author: davegaeddert

README.md

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: dropseed/changerelease@master
+    - uses: dropseed/changerelease@v1
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
 ```