all: change module to google.golang.org/protobuf

Temporarily remove go.mod, since we can't generate an accurate one until
the corresponding v1 change is submitted.

Change-Id: I1e1ad97f2b455e33f61ffaeb8676289795e47e72
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/177000
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/internal/value/convert.go b/internal/value/convert.go
index 4852b40..793af22 100644
--- a/internal/value/convert.go
+++ b/internal/value/convert.go
@@ -10,8 +10,8 @@
 	"fmt"
 	"reflect"
 
-	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
-	piface "github.com/golang/protobuf/v2/runtime/protoiface"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
 )
 
 // Unwrapper unwraps the value to the underlying value.
diff --git a/internal/value/list.go b/internal/value/list.go
index 37f9b55..f40a73f 100644
--- a/internal/value/list.go
+++ b/internal/value/list.go
@@ -7,7 +7,7 @@
 import (
 	"reflect"
 
-	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
 )
 
 func ListOf(p interface{}, c Converter) interface {
diff --git a/internal/value/map.go b/internal/value/map.go
index 2637f94..3461d2e 100644
--- a/internal/value/map.go
+++ b/internal/value/map.go
@@ -7,7 +7,7 @@
 import (
 	"reflect"
 
-	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
 )
 
 func MapOf(p interface{}, kc, kv Converter) interface {