docs(readme): Update version number

Author: DenverCoder1

README.md

@@ -18,7 +18,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: DenverCoder1/doxygen-github-pages-action@v1.3.0
+      - uses: DenverCoder1/doxygen-github-pages-action@v1.3.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
 ```
@@ -48,7 +48,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: DenverCoder1/doxygen-github-pages-action@v1.3.0
+      - uses: DenverCoder1/doxygen-github-pages-action@v1.3.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           branch: gh-pages