Set default value for repo-token (#32)

* Set default value for `repo-token`

* Add "Use your token" to README

* Use v1.3.2

* Add pull-requests: write permission

* Add contents: read permission

* Revoke contents: read

.github/workflows/ci.yml

@@ -1,5 +1,7 @@
 name: 'Auto Author Assign'
 on: [pull_request_target]
+permissions:
+  pull-requests: write
 jobs:
   assign-author:
     runs-on: ubuntu-latest
@@ -8,5 +10,3 @@ jobs:
         uses: actions/checkout@v2
       - name: Test toshimaru/auto-author-assign action
         uses: ./ # Uses an action in the root directory
-        with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}"

README.md

@@ -14,7 +14,7 @@ This action automatically assigns PR author as an assignee.
 
 ## Usage
 
-```yaml
+```yml
 # .github/workflows/auto-author-assign.yml
 name: 'Auto Author Assign'
 
@@ -30,11 +30,25 @@ jobs:
   assign-author:
     runs-on: ubuntu-latest
     steps:
-      - uses: toshimaru/auto-author-assign@v1.3.0
+      - uses: toshimaru/auto-author-assign@v1.3.2
+```
+
+## Use your token
+
+You can specify your own token.
+
+```yml
+jobs:
+  assign-author:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: toshimaru/auto-author-assign
         with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          repo-token: "${{ secrets.YOUR_TOKEN }}"
 ```
 
+If not specified, `GITHUB_TOKEN` will be used by default.
+
 ## Skip assigning author
 
 `auto-author-assign` action skips assigning the author when:

action.yml

@@ -5,6 +5,7 @@ inputs:
   repo-token:
     description: 'A token for the repository'
     required: true
+    default: '${{ github.token }}'
 runs:
   using: 'node12'
   main: 'dist/index.js'