drop go 1.18, add 1.21, do not fail fast

.github/workflows/release.yml

@@ -15,8 +15,9 @@ jobs:
   test:
     runs-on: ubuntu-20.04
     strategy:
+      fail-fast: false
       matrix:
-        go: ['1.18', '1.19', '1.20']
+        go: ['1.19', '1.20', '1.21']
     name: Go ${{ matrix.go }} test
     steps:
       - uses: actions/checkout@v3

README.md

@@ -115,10 +115,10 @@ Versions that also build are marked with :warning:.
 
 | Version | Supported          |
 | ------- | ------------------ |
-| <1.18   | :x:                |
+| <1.19   | :x:                |
-| 1.18    | :warning:          |
+| 1.19    | :warning:          |
-| 1.19    | :white_check_mark: |
 | 1.20    | :white_check_mark: |
+| 1.21    | :white_check_mark: |
 
 ## Why another library
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/zitadel/oidc/v2
 
-go 1.18
+go 1.19
 
 require (
 	github.com/golang/mock v1.6.0