Issues with upgrading gogo/protobuf (lots of XXX_ fields/methods)

[yurishkuro]

trying out an upgrade:

diff --git a/Gopkg.toml b/Gopkg.toml
index 3073437..25bf653 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -109,11 +109,11 @@ required = [

 [[constraint]]
   name = "github.com/gogo/googleapis"
-  revision = "b23578765ee54ff6bceff57f397d833bf4ca6869"
+  version = "1.1.0"

 [[constraint]]
   name = "github.com/gogo/protobuf"
-  revision = "fd9a4790f3963525fb889cc00e0a8f828e0b3a29"
+  version = "1.2.0"

The model code gets generated with lots of unpleasant XXX_ fields and methods, e.g. KeyValue gets these:

+       XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+       XXX_unrecognized     []byte    `json:"-"`
+       XXX_sizecache        int32     `json:"-"`

According to gogo issues, it's an upstream change (golang/protobuf#276).