Avoid the need for GITHUB_TOKEN

Instead of getting the (latest) Go releases from git tags GitHubs API (and thus needing a token to avoid being rate limited) we pull the versions from https://go.dev/dl/?mode=json&include=all instead.

#minor

.github/workflows/test.yml

@@ -32,8 +32,6 @@ jobs:
         id: go-version
         with:
           working-directory: ./__tests__/testdata
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - run: |
           test '${{ steps.go-version.outputs.module }}' == 'example.com/go/testmodule'
       - run: |

README.md

@@ -24,8 +24,8 @@ The action reads the minimal supported Go version from your `go.mod`
 file and exposes it as a variable to you workflow.
 
 It also pulls the list of release tags from
-[github.com/golang/go](https://github.com/golang/go) and exposes the
-latest released Go version as a variable as well.
+[https://go.dev/dl/](https://go.dev/dl/) and exposes the latest
+released Go version as a variable as well.
 
 From the list of released go versions and the minimal version your
 module supports we also build a "matrix" variable to be used as a
@@ -46,14 +46,6 @@ working-directory:
   default: .
 ```
 
-To avoid API rate limits when fetching go releases from GitHub it is
-recommended to set a token:
-
-```yaml
-  env:
-    GITHUB_TOKEN: ${{ github.token }}
-```
-
 ## Outputs
 
 ```yaml
@@ -84,8 +76,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: arnested/go-version-action@v1
         id: go-version
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
       - name: Install Go ${{ steps.go-version.outputs.minimal }}
         uses: actions/setup-go@v2
         with:
@@ -115,8 +105,6 @@ jobs:
     - uses: actions/checkout@v2
     - uses: arnested/go-version-action@v1
       id: versions
-      env:
-        GITHUB_TOKEN: ${{ github.token }}
   test:
     name: Test
     runs-on: ubuntu-latest

__tests__/main.test.ts

@@ -1,12 +1,5 @@
-import {
-  gomod,
-  latest,
-  minimal,
-  matrix,
-  modulename,
-  getTags
-} from '../src/go-versions'
 import fs from 'fs'
+import {gomod, latest, matrix, minimal, modulename} from '../src/go-versions'
 
 test('test module name', () => {
   const content = gomod('__tests__/testdata/go.mod')
@@ -19,13 +12,13 @@ test('test minimal version', () => {
 })
 
 test('test latest version', () => {
-  expect(latest(['1.16', '1.15', '1.14', '1.13'])).toEqual('1.16')
+  expect(latest(['1.18', '1.17', '1.16', '1.15', '1.14', '1.13'])).toEqual(
+    '1.18'
+  )
 })
 
 test('test version matrix', () => {
-  const t = JSON.parse(
-    fs.readFileSync('__tests__/testdata/listTags.json', 'utf8')
-  )
+  const t = JSON.parse(fs.readFileSync('__tests__/testdata/dl.json', 'utf8'))
   const m = matrix('1.13', t)
-  expect(m).toEqual(['1.16', '1.15', '1.14', '1.13'])
+  expect(m).toEqual(['1.18', '1.17', '1.16', '1.15', '1.14', '1.13'])
 })