Change some URLs from japaric to rust-lang

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 ## I would like to see an example about $TOPIC
 
 Please check if such topic is already part of our
-[TODO list](/~https://github.com/japaric/rust-by-example/issues/1). If that's
+[TODO list](/~https://github.com/rust-lang/rust-by-example/issues/1). If that's
 not the case, leave your request as a comment on that issue.
 
 ## There's a typo/error in example $X
@@ -27,7 +27,7 @@ start the commit message with the example id, e.g. "type/literals: fix typo".
 ## Check if there is an action plan for that topic
 
 Look for
-[issues](/~https://github.com/japaric/rust-by-example/issues?labels=&page=1&state=open)
+[issues](/~https://github.com/rust-lang/rust-by-example/issues?labels=&page=1&state=open)
 that have a C-* label:
 
 * C-new: A new chapter, there probably a lot to do here.

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/rust-lang/rust-by-example.svg?branch=master)](https://travis-ci.org/japaric/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)
 # Rust by Example
 
 ## What's this?

examples/todo/input.md

@@ -1,2 +1,2 @@
 If you would like to see a chapter about some concept or library, please drop a
-comment in [issue #1](/~https://github.com/japaric/rust-by-example/issues/1)
+comment in [issue #1](/~https://github.com/rust-lang/rust-by-example/issues/1)