Fields aren't named in the same manner as golang/protobuf

[tmc]

For example:

diff --git a/examples/examplepb/echo_service.proto b/examples/examplepb/echo_service.proto
index 5e44b28..f39e711 100644
--- a/examples/examplepb/echo_service.proto
+++ b/examples/examplepb/echo_service.proto
@@ -5,13 +5,13 @@ package gengo.grpc.gateway.examples.examplepb;
 import "google/api/annotations.proto";

 message SimpleMessage {
-       string id = 1;
+       string ID = 1;
 }

 service EchoService {
        rpc Echo(SimpleMessage) returns (SimpleMessage) {
                option (google.api.http) = {
-                       post: "/v1/example/echo/{id}"
+                       post: "/v1/example/echo/{ID}"
                };
        }
        rpc EchoBody(SimpleMessage) returns (SimpleMessage) {

Will fail with

# github.com/gengo/grpc-gateway/examples/examplepb
examples/examplepb/echo_service.pb.gw.go:47: protoReq.Id undefined (type SimpleMessage has no field or method Id, but does have ID)

Simply using the exported CamelCase function fixes this:

package utilities

import "github.com/gogo/protobuf/protoc-gen-gogo/generator"

// PascalFromSnake converts an identifier in snake_case into PascalCase.
func PascalFromSnake(str string) string {
    return generator.CamelCase(str)
}