chore: Prepare 0.4 release (#538)

* Prepare `0.4` release

* Fix cargo issues

examples/Cargo.toml

@@ -167,7 +167,7 @@ tracing-futures = "0.2"
 prost-types = "0.7"
 # Hyper example
 hyper = "0.14"
-warp = { git = "https://github.com/aknuds1/warp", branch = "chore/upgrade-tokio",  default-features = false }
+warp = { git = "https://github.com/seanmonstar/warp",  default-features = false }
 http = "0.2"
 http-body = "0.4"
 pin-project = "1.0"

examples/helloworld-tutorial.md

@@ -113,12 +113,12 @@ name = "helloworld-client"
 path = "src/client.rs"
 
 [dependencies]
-tonic = "0.3"
-prost = "0.6"
+tonic = "0.4"
+prost = "0.7"
 tokio = { version = "0.2", features = ["macros"] }
 
 [build-dependencies]
-tonic-build = "0.3"
+tonic-build = "0.4"
 ```
 
 We include `tonic-build` as a useful way to incorporate the generation of our client and server gRPC code into the build process of our application. We will setup this build process now:

examples/routeguide-tutorial.md

@@ -180,8 +180,8 @@ Edit `Cargo.toml` and add all the dependencies we'll need for this example:
 
 ```toml
 [dependencies]
-tonic = "0.3"
-prost = "0.6"
+tonic = "0.4"
+prost = "0.7"
 futures-core = "0.3"
 futures-util = "0.3"
 tokio = { version = "0.2", features = ["macros", "sync", "stream", "time"] }
@@ -192,7 +192,7 @@ serde_json = "1.0"
 rand = "0.7"
 
 [build-dependencies]
-tonic-build = "0.3"
+tonic-build = "0.4"
 ```
 
 Create a `build.rs` file at the root of your crate: