chore: Adjust for Go1.17

- update actions to use Go1.17
- add test file with build tag for Go1.17 due to
  csv.ParseError.Column being now 1-indexed

Author: jszwec

.github/workflows/go.yml

@@ -11,7 +11,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.15, 1.16]
+        go-version: [1.16, 1.17]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     runs-on: ${{ matrix.os }}

csvutil_go110_test.go

@@ -1,4 +1,5 @@
-// +build go1.10
+//go:build !go1.17 && go1.10
+// +build !go1.17,go1.10
 
 package csvutil
 

csvutil_go117_test.go

@@ -0,0 +1,28 @@
+//go:build go1.17
+// +build go1.17
+
+package csvutil
+
+import (
+	"encoding/csv"
+	"reflect"
+)
+
+// In Go1.17 csv.ParseError.Column became 1-indexed instead of 0-indexed.
+// so we need this file for Go 1.17+.
+
+var testUnmarshalInvalidFirstLineErr = &csv.ParseError{
+	StartLine: 1,
+	Line:      1,
+	Column:    2,
+	Err:       csv.ErrQuote,
+}
+
+var testUnmarshalInvalidSecondLineErr = &csv.ParseError{
+	StartLine: 2,
+	Line:      2,
+	Column:    2,
+	Err:       csv.ErrQuote,
+}
+
+var ptrUnexportedEmbeddedDecodeErr = errPtrUnexportedStruct(reflect.TypeOf(new(embedded)))