use golangci-lint v1.26

Update readme and action

.github/workflows/golangci.yml

@@ -5,12 +5,10 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: golangci-lint
         uses: ./
         with:
-          github_token: ${{ secrets.github_token }}
           directory: sample
           format: colored-line-number
           flags: --issues-exit-code 0

Dockerfile

@@ -1,4 +1,4 @@
-FROM golangci/golangci-lint:v1.25
+FROM golangci/golangci-lint:v1.26
 
 COPY entrypoint.sh /entrypoint.sh
 

README.md

@@ -1,5 +1,22 @@
 # golangci-lint-action
 
-Work in progress
+![docker image](https://github.com/golangci/golangci-lint-action/workflows/docker%20image/badge.svg)
+
+Action that runs [golangci-lint](https://github.com/golangci/golangci-lint) and reports issues from linters.
+
+You can put `.github/workflows/lint.yml` with following contents:
+```yaml
+name: golangci
+on: [push]
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v0.0.2
+```
 
 Based on [reviewdog action](https://github.com/reviewdog/action-golangci-lint).

action.yml

@@ -5,7 +5,7 @@ author: 'golangci'
 inputs:
   github_token:
     description: 'GITHUB_TOKEN'
-    required: true
+    required: false
   flags:
     description: 'GolangCI command line flags'
     required: false