Merge pull request #1167 from lzutao/patch-1

Update links in README

README.md

@@ -1,13 +1,16 @@
 # Rust By Example
 
-[![Build Status](https://travis-ci.org/rust-lang/rust-by-example.svg?branch=master)](https://travis-ci.org/rust-lang/rust-by-example)
+[![Build Status][travis-badge]][travis-repo]
+
+[travis-badge]: https://travis-ci.com/rust-lang/rust-by-example.svg?branch=master
+[travis-repo]: https://travis-ci.com/rust-lang/rust-by-example
 
 Learn Rust with examples (Live code editor included)
 
 ## Using
 
-If you'd like to read Rust by Example, you can visit
-[https://doc.rust-lang.org/stable/rust-by-example/](https://doc.rust-lang.org/stable/rust-by-example/) to read it online.
+If you'd like to read Rust by Example, you can visit https://doc.rust-lang.org/rust-by-example/ 
+to read it online.
 
 If you'd like to read it locally, [install Rust], and then:
 
@@ -19,7 +22,7 @@ $ mdbook build
 $ mdbook serve
 ```
 
-[install Rust]: http://rust-lang.org/install.html
+[install Rust]: https://www.rust-lang.org/tools/install
 
 To be able to run the examples, you must be connected to the internet; you can
 read all content offline, however!