fix: add protobuf_generate as dependency for transcoding example

Author: polvalente

examples/helloworld_transcoding/mix.exs

@@ -21,7 +21,8 @@ defmodule Helloworld.Mixfile do
       {:grpc, path: "../../"},
       {:protobuf, "~> 0.14"},
       {:jason, "~> 1.3.0"},
-      {:google_protos, "~> 0.3.0"}
+      {:google_protos, "~> 0.3.0"},
+      {:protobuf_generate, "~> 0.1.1", only: [:dev, :test]}
     ]
   end
 end

examples/helloworld_transcoding/mix.lock

@@ -7,6 +7,7 @@
   "jason": {:hex, :jason, "1.3.0", "fa6b82a934feb176263ad2df0dbd91bf633d4a46ebfdffea0c8ae82953714946", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "53fc1f51255390e0ec7e50f9cb41e751c260d065dcba2bf0d08dc51a4002c2ac"},
   "mint": {:hex, :mint, "1.7.1", "113fdb2b2f3b59e47c7955971854641c61f378549d73e829e1768de90fc1abf1", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "fceba0a4d0f24301ddee3024ae116df1c3f4bb7a563a731f45fdfeb9d39a231b"},
   "protobuf": {:hex, :protobuf, "0.14.1", "9ac0582170df27669ccb2ef6cb0a3d55020d58896edbba330f20d0748881530a", [:mix], [{:jason, "~> 1.2", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "39a9d49d346e3ed597e5ae3168a43d9603870fc159419617f584cdf6071f0e25"},
+  "protobuf_generate": {:hex, :protobuf_generate, "0.1.3", "57841bc60e2135e190748119d83f78669ee7820c0ad6555ada3cd3cd7df93143", [:mix], [{:protobuf, "~> 0.12", [hex: :protobuf, repo: "hexpm", optional: false]}], "hexpm", "dae4139b00ba77a279251a0ceb5593b1bae745e333b4ce1ab7e81e8e4906016b"},
   "ranch": {:hex, :ranch, "1.8.0", "8c7a100a139fd57f17327b6413e4167ac559fbc04ca7448e9be9057311597a1d", [:make, :rebar3], [], "hexpm", "49fbcfd3682fab1f5d109351b61257676da1a2fdbe295904176d5e521a2ddfe5"},
   "telemetry": {:hex, :telemetry, "1.3.0", "fedebbae410d715cf8e7062c96a1ef32ec22e764197f70cda73d82778d61e7a2", [:rebar3], [], "hexpm", "7015fc8919dbe63764f4b4b87a95b7c0996bd539e0d499be6ec9d7f3875b79e6"},
 }