Update format_pr.yml

copied from https://github.com/JuliaReinforcementLearning/ReinforcementLearningCore.jl/blob/master/.github/workflows/format_pr.yml

Author: norci

.github/workflows/format_pr.yml

@@ -1,37 +1,29 @@
 name: format-pr
-
 on:
   schedule:
-    - cron: '0 * * * *'
+    - cron: '0 0 * * *'
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        julia-version: [1.3.0]
-        julia-arch: [x86]
-        os: [ubuntu-latest]
+    runs-on: ubuntu-latest
     steps:
-      - uses: julia-actions/setup-julia@latest
-        with:
-          version: ${{ matrix.julia-version }}
-
       - uses: actions/checkout@v2
       - name: Install JuliaFormatter and format
         run: |
           julia  -e 'import Pkg; Pkg.add("JuliaFormatter")'
-          julia  -e 'using JuliaFormatter; format(".";verbose=true, always_for_in=true)'
-          
+          julia  -e 'using JuliaFormatter; format(".")'
       # https://github.com/marketplace/actions/create-pull-request
+      # https://github.com/peter-evans/create-pull-request#reference-example
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v2
+        id: cpr
+        uses: peter-evans/create-pull-request@v3
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: Format .jl files
           title: 'Automatic JuliaFormatter.jl run'
           branch: auto-juliaformatter-pr
+          delete-branch: true
           labels: formatting, automated pr, no changelog
       - name: Check outputs
         run: |
-          echo 'Pull Request Number - ${{ env.PULL_REQUEST_NUMBER }}'
-          echo 'Pull Request Number - ${{ steps.cpr.outputs.pr_number }}'
+          echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
+          echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"