Drop support for Go 1.18 and add support for Go 1.20

Author: dhui

.github/workflows/ci.yaml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v3
         with:
-          go-version: 1.19
+          go-version: "1.20.x"
       - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.18.x", "1.19.x"]
+        go: ["1.19.x", "1.20.x"]
     steps:
       - uses: actions/checkout@v3
 

README.md

@@ -3,7 +3,7 @@
 [![Coverage Status](https://img.shields.io/coveralls/github/golang-migrate/migrate/master.svg)](https://coveralls.io/github/golang-migrate/migrate?branch=master)
 [![packagecloud.io](https://img.shields.io/badge/deb-packagecloud.io-844fec.svg)](https://packagecloud.io/golang-migrate/migrate?filter=debs)
 [![Docker Pulls](https://img.shields.io/docker/pulls/migrate/migrate.svg)](https://hub.docker.com/r/migrate/migrate/)
-![Supported Go Versions](https://img.shields.io/badge/Go-1.18%2C%201.19-lightgrey.svg)
+![Supported Go Versions](https://img.shields.io/badge/Go-1.19%2C%201.20-lightgrey.svg)
 [![GitHub Release](https://img.shields.io/github/release/golang-migrate/migrate.svg)](https://github.com/golang-migrate/migrate/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/golang-migrate/migrate/v4)](https://goreportcard.com/report/github.com/golang-migrate/migrate/v4)