chore: support Go 1.20 and min Go 1.19 (#233)

.github/workflows/test.yml

@@ -10,10 +10,10 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ 1.18, 1.19 ]
+        go-version: [ 1.19, "1.20" ]
     runs-on: ubuntu-latest
     env:
-      GOLANGCI_LINT_VERSION: v1.50.1
+      GOLANGCI_LINT_VERSION: v1.51.0
 
     steps:
       - name: Install Go

go.mod

@@ -1,14 +1,19 @@
 module github.com/hamba/avro/v2
 
-go 1.16
+go 1.19
 
 require (
 	github.com/ettle/strcase v0.1.1
 	github.com/golang/snappy v0.0.4
 	github.com/json-iterator/go v1.1.12
 	github.com/mitchellh/mapstructure v1.5.0
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2
 	github.com/stretchr/testify v1.7.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )