Bump Gitaly Proto to v0.99

Gemfile

@@ -416,7 +416,7 @@ group :ed25519 do
 end
 
 # Gitaly GRPC client
-gem 'gitaly-proto', '~> 0.97.0', require: 'gitaly'
+gem 'gitaly-proto', '~> 0.99.0', require: 'gitaly'
 gem 'grpc', '~> 1.11.0'
 
 # Locked until https://github.com/google/protobuf/issues/4210 is closed

Gemfile.lock

@@ -291,7 +291,7 @@ GEM
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
     gherkin-ruby (0.3.2)
-    gitaly-proto (0.97.0)
+    gitaly-proto (0.99.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.10)
     github-linguist (5.3.3)
@@ -1060,7 +1060,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly-proto (~> 0.97.0)
+  gitaly-proto (~> 0.99.0)
   github-linguist (~> 5.3.3)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-gollum-lib (~> 4.2)