Test Go 1.20 compatibility (#88)

Author: pellared

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.19'
+          go-version: '1.20'
       - run: ./goyek.sh -v all diff
       - name: Upload HTML coverage
         uses: actions/upload-artifact@v3
@@ -33,6 +33,7 @@ jobs:
         go-version:
           - '1.18'
           - '1.19'
+          - '1.20'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3

build/go.mod

@@ -1,6 +1,6 @@
 module github.com/fluentassert/verify/build
 
-go 1.19
+go 1.20
 
 require (
 	github.com/client9/misspell v0.3.4