Merge pull request #483 from shogo82148/update-readme-2024-02-05

Update Go version and actions versions

README.md

@@ -12,11 +12,11 @@
 Add the following step snippet to your workflows.
 
 ```yaml
-- uses: actions/checkout@v3
+- uses: actions/checkout@v4
 
-- uses: actions/setup-go@v3
+- uses: actions/setup-go@v5
   with:
-    go-version: '1.19'
+    go-version: "1.21"
 - run: go test -v -coverprofile=profile.cov ./...
 
 - uses: shogo82148/actions-goveralls@v1
@@ -32,28 +32,29 @@ Here is an example of matrix builds.
 ```yaml
 on: [push, pull_request]
 jobs:
-
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         go:
-          - '1.19'
-          - '1.18'
-          - '1.17'
-          - '1.16'
-          - '1.15'
-          - '1.14'
-          - '1.13'
-          - '1.12'
-          - '1.11'
+          - "1.21"
+          - "1.20"
+          - "1.19"
+          - "1.18"
+          - "1.17"
+          - "1.16"
+          - "1.15"
+          - "1.14"
+          - "1.13"
+          - "1.12"
+          - "1.11"
 
     steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: go test -v -coverprofile=profile.cov ./...
 
       - name: Send coverage