remove: support for go v1.18

.github/workflows/test.yml

@@ -14,9 +14,9 @@ jobs:
     strategy:
       matrix:
         go-version:
-          - '1.18.x'
           - '1.19.x'
           - '1.20.x'
+          - '1.21.x'
         platform: [ubuntu-latest]
 
     name: test
@@ -38,26 +38,26 @@ jobs:
 
     steps:
       - name: checkout the code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: setup go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
 
       - name: unshallow
         run: git fetch --prune --unshallow
 
       - name: golanci-linter
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v4
         with:
-          version: v1.51.2
+          version: v1.56.2
 
       - name: run unit tests
         run: make test
 
       - name: upload code coverage
-        uses: codecov/codecov-action@v3.1.1
+        uses: codecov/codecov-action@v4
         if: contains(github.ref, 'master')
         with:
           file: ./cover.out

README.md

@@ -9,7 +9,7 @@ Simple interface for caching
 
 ## Installation
 
-Cachego requires Go 1.18 or later.
+Cachego requires Go 1.19 or later.
 
 ```
 go get github.com/faabiosr/cachego

go.mod

@@ -1,6 +1,6 @@
 module github.com/faabiosr/cachego
 
-go 1.18
+go 1.19
 
 require (
 	github.com/bradfitz/gomemcache v0.0.0-20230124162541-5f7a7d875746