v0.4.0 - Support Go Modules

• Support Go Modules #83 #176 #179
• Fix default project layout #181
• Support (*grapiserver.Engine).ServerContext(context.Context) #183

How to migrate

0. Bump grapi version
   • If you use dep, update Gopkg.toml

      [[constraint]]
        name = "github.com/izumin5210/grapi"
     -  version = "0.3.0"
     +  version = "0.4.0"

   • and run dep ensure
1. Update gex and tools.go

   • go get -u github.com/izumin5210/gex/cmd/gex
     gex --regen
     

2. Initialize Go Modules

   • go mod init
     go mod tidy
     

3. Update grapi.toml

   • package = "yourcompany.yourappname"
     
     [grapi]
     server_dir = "./app/server"
     
     [protoc]
     protos_dir = "./api/protos"
     out_dir = "./api"
     import_dirs = [
       "./api/protos",
     -  "./vendor/github.com/grpc-ecosystem/grpc-gateway",
     -  "./vendor/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis",
     +  '{{ module "github.com/grpc-ecosystem/grpc-gateway" }}',
     +  '{{ module "github.com/grpc-ecosystem/grpc-gateway" }}/third_party/googleapis',
     ]
     
       [[protoc.plugins]]
       name = "go"
       args = { plugins = "grpc", paths = "source_relative" }
     
       [[protoc.plugins]]
       name = "grpc-gateway"
       args = { logtostderr = true, paths = "source_relative" }
     
       [[protoc.plugins]]
       name = "swagger"
       args = { logtostderr = true }

4. Drop dep

   • rm Gopkg.*