Update docs

README.md

@@ -5,7 +5,7 @@ external pager. Similar to what `git` does for its output.
 
 # Quick Start
 
-```
+```rust
 extern crate pager;
 
 use pager::Pager;
@@ -25,7 +25,7 @@ If found it is used as a default pager.
 You can control pager to a limited degree. For example you can change the
 environment variable used for finding pager executable.
 
-```
+```rust
 extern crate pager;
 
 use pager::Pager;

src/lib.rs

@@ -3,7 +3,7 @@
 //!
 //! Quick Start
 //!
-//! ```
+//! ```rust
 //! extern crate pager;
 //! use pager::Pager;
 //! fn main() {
@@ -21,7 +21,7 @@
 //! You can control pager to a limited degree. For example you can change the
 //! environment variable used for finding pager executable.
 //!
-//! ```
+//! ```rust
 //! extern crate pager;
 //! use pager::Pager;
 //! fn main() {