Merge pull request #269 from quartiq/fix-pool-example

pool: fix example

Author: korken89

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+* Fixed `pool` example in docstring.
+
 ### Added
 
 ### Changed

src/pool/mod.rs

@@ -15,7 +15,11 @@
 //! #![no_main]
 //! #![no_std]
 //!
-//! use heapless::{pool, pool::singleton::Box};
+//! use cortex_m_rt::{entry, exception};
+//! use heapless::{
+//!     pool,
+//!     pool::singleton::{Box, Pool},
+//! };
 //!
 //! // instantiate a memory pool of `[u8; 128]` blocks as a global singleton
 //! pool!(