Drop compatibility testing for Go 1.18 (#3813)

* Drop support for Go 1.18

* Add changes to changelog

* Add PR number

.github/workflows/benchmark.yml

@@ -4,7 +4,7 @@ on:
     branches:
       - main
 env:
-  DEFAULT_GO_VERSION: 1.18
+  DEFAULT_GO_VERSION: 1.20
 jobs:
   benchmark:
     name: Benchmarks

.github/workflows/ci.yml

@@ -115,7 +115,7 @@ jobs:
   compatibility-test:
     strategy:
       matrix:
-        go-version: ["1.20", 1.19, 1.18]
+        go-version: ["1.20", 1.19]
         os: [ubuntu-latest, macos-latest, windows-latest]
         # GitHub Actions does not support arm* architectures on default
         # runners. It is possible to acomplish this with a self-hosted runner
@@ -158,4 +158,4 @@ jobs:
       - name: Test if compatibility-test passed
         run: |
           echo ${{ needs.compatibility-test.result }}
-          test ${{ needs.compatibility-test.result }} == "success"
+          test ${{ needs.compatibility-test.result }} == "success"

.github/workflows/dependabot.yml

@@ -13,7 +13,7 @@ jobs:
         ref: ${{ github.head_ref }}
     - uses: actions/setup-go@v3
       with:
-        go-version: '^1.18.0'
+        go-version: '^1.20.0'
     - uses: evantorrie/mott-the-tidier@v1-beta
       id: modtidy
       with:

CHANGELOG.md

@@ -8,6 +8,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Changed
+
+- Dropped compatibility testing for [Go 1.18].
+  The project no longer guarantees support for this version of Go. (#3813)
+
 ### Fixed
 
 - Handle empty environment variable as it they were not set. (#3764)

README.md

@@ -52,19 +52,14 @@ Currently, this project supports the following environments.
 | ------- | ---------- | ------------ |
 | Ubuntu  | 1.20       | amd64        |
 | Ubuntu  | 1.19       | amd64        |
-| Ubuntu  | 1.18       | amd64        |
 | Ubuntu  | 1.20       | 386          |
 | Ubuntu  | 1.19       | 386          |
-| Ubuntu  | 1.18       | 386          |
 | MacOS   | 1.20       | amd64        |
 | MacOS   | 1.19       | amd64        |
-| MacOS   | 1.18       | amd64        |
 | Windows | 1.20       | amd64        |
 | Windows | 1.19       | amd64        |
-| Windows | 1.18       | amd64        |
 | Windows | 1.20       | 386          |
 | Windows | 1.19       | 386          |
-| Windows | 1.18       | 386          |
 
 While this project should work for other systems, no compatibility guarantees
 are made for those systems currently.