Fix update-parsers workflow

.github/workflows/update-parsers-pr.yml

@@ -1,14 +1,18 @@
 name: Make Parser Update PR
 
-on: push
+on:
+  push:
+    branches:
+      - master
 
 jobs:
   update-parsers:
     name: Update parsers
     runs-on: ubuntu-latest
-    #if: github.ref == 'master'
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
 
       - name: Prepare
         run: |
@@ -19,10 +23,13 @@ jobs:
           mkdir -p ~/.local/share/nvim/site/pack/nvim-treesitter/start
           ln -s $(pwd) ~/.local/share/nvim/site/pack/nvim-treesitter/start
 
-      # inspired by nvim-lspconfigs
       - name: Update parsers
         run: |
           ./nvim.appimage --headless -c "luafile ./scripts/write-lockfile.lua" -c "q"
 
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v3
+        with:
+          commit-message: Update lockfile.json
+          title: Update lockfile.json
+          branch: update-lockfile-pr