make generate: stringer was updated and now uses strconv instead of fmt

https://github.com/golang/tools/commit/bd4635fd25596cdd56c1fb399c53b351d1a81f2d#diff-0415b5286e4cf3e373f349d917e5e039

rpc/status_string.go

@@ -2,7 +2,7 @@
 
 package rpc
 
-import "fmt"
+import "strconv"
 
 const _Status_name = "StatusOKStatusRequestErrorStatusServerErrorStatusError"
 
@@ -11,7 +11,7 @@ var _Status_index = [...]uint8{0, 8, 26, 43, 54}
 func (i Status) String() string {
 	i -= 1
 	if i >= Status(len(_Status_index)-1) {
-		return fmt.Sprintf("Status(%d)", i+1)
+		return "Status(" + strconv.FormatInt(int64(i+1), 10) + ")"
 	}
 	return _Status_name[_Status_index[i]:_Status_index[i+1]]
 }