feat: Update prost and friends to 0.9 (#791)

tonic-types/Cargo.toml

@@ -1,10 +1,10 @@
 [package]
 name = "tonic-types"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Lucio Franco <[email protected]>"]
 edition = "2018"
 license = "MIT"
-documentation = "https://docs.rs/tonic-types/0.3.0/tonic-types/"
+documentation = "https://docs.rs/tonic-types/0.4.0/tonic-types/"
 repository = "https://github.com/hyperium/tonic"
 homepage = "https://github.com/hyperium/tonic"
 description = """
@@ -15,8 +15,8 @@ categories = ["web-programming", "network-programming", "asynchronous"]
 keywords = ["rpc", "grpc", "protobuf"]
 
 [dependencies]
-prost = "0.8"
-prost-types = "0.8"
+prost = "0.9"
+prost-types = "0.9"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"