make generated code formatting consistent across Go versions

Author: dabbertorres

internal/autowire/autowire.go

@@ -268,8 +268,8 @@ func (g *gen) frame(tags string) []byte {
 	}
 	buf.WriteString("// Code generated by Autowire. DO NOT EDIT.\n\n")
 	buf.WriteString("//go:generate go run github.com/dabbertorres/autowire/cmd/autowire" + tags + "\n\n")
-	buf.WriteString("//+build !wireinject\n")
 	buf.WriteString("//go:build !wireinject\n")
+	buf.WriteString("// +build !wireinject\n\n")
 	buf.WriteString("package ")
 	buf.WriteString(g.pkg.Name)
 	buf.WriteString("\n\n")