Add Fs2GrpcServiceSuffix, Fs2GrpcDisableTrailers, Fs2GrpcRenderContextAsImplicit code generator options to the README.md

Author: iRevive

README.md

@@ -116,6 +116,9 @@ The full set of options available are:
  - `CodeGeneratorOption.Fs2Grpc` (included by default) - generate grpc bindings for FS2/cats
  - `CodeGeneratorOption.SingleLineToProtoString` - `toProtoString` generates single line
  - `CodeGeneratorOption.AsciiFormatToString` - `toString` uses `toProtoString` functionality
+ - `CodeGeneratorOption.Fs2GrpcServiceSuffix` - suffix used for generated service, e.g. service `Foo` with suffix `Fs2Grpc` results in `FooFs2Grpc`
+ - `CodeGeneratorOption.Fs2GrpcDisableTrailers` - disable generation of the trailers
+ - `CodeGeneratorOption.Fs2GrpcRenderContextAsImplicit` - renders context in the implicit position
 
 ## Pass additional protoc options