Auto merge of #1027 - bcko:patch-1, r=alexcrichton

added badges

added Documentation, Latest Version, License badges similar to rand crate. https://crates.io/crates/rand

Author: bors

README.md

@@ -6,8 +6,10 @@ various systems, including libc.
 
 [![Build Status](https://travis-ci.org/rust-lang/libc.svg?branch=master)](https://travis-ci.org/rust-lang/libc)
 [![Build status](https://ci.appveyor.com/api/projects/status/github/rust-lang/libc?svg=true)](https://ci.appveyor.com/project/rust-lang-libs/libc)
+[![Latest version](https://img.shields.io/crates/v/libc.svg)](https://crates.io/crates/libc)
+[![Documentation](https://docs.rs/libc/badge.svg)](https://docs.rs/libc)
+![License](https://img.shields.io/crates/l/libc.svg)
 
-[Documentation](#platforms-and-documentation)
 
 ## Usage