chore(lib): prepare master for 0.13.x changes

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "hyper"
-version = "0.12.32" # don't forget to update html_root_url
+version = "0.13.0-a.0" # don't forget to update html_root_url
 description = "A fast and correct HTTP library."
 readme = "README.md"
 homepage = "https://hyper.rs"
@@ -11,6 +11,8 @@ authors = ["Sean McArthur <sean@seanmonstar.com>"]
 keywords = ["http", "hyper", "hyperium"]
 categories = ["network-programming", "web-programming::http-client", "web-programming::http-server"]
 
+publish = false
+
 include = [
   "Cargo.toml",
   "LICENSE",

README.md

@@ -9,7 +9,14 @@ A **fast** and **correct** HTTP implementation for Rust.
 
 **Get started** by looking over the [guides](https://hyper.rs/guides).
 
-**Hyper is a relatively low-level library, if you are looking for simple high-level HTTP client, then you may wish to consider [reqwest](https://github.com/seanmonstar/reqwest), which is built on top of this library.**
+**Hyper is a relatively low-level library, if you are looking for simple
+high-level HTTP client, then you may wish to consider
+[reqwest](https://github.com/seanmonstar/reqwest), which is built on top of
+this library.**
+
+*NOTE*: hyper's [master](https://github.com/hyperium/hyper) branch is currently
+preparing breaking changes, for most recently released code, look to the
+[0.12.x](https://github.com/hyperium/hyper/tree/0.12.x) branch.
 
 ## Overview