Remove deprecated inner attribute syntax in quick start

Author: nelsonjchen

README.md

@@ -25,7 +25,7 @@ error-chain = "0.5"
 Write this at the top of your crate:
 
 ```rust
-#![recursion_limit = "1024"];
+#![recursion_limit = "1024"]
 ```
 
 Again near the top of your crate, import the `error_chain` crate and its macros:

src/lib.rs

@@ -65,7 +65,7 @@
 //! Write this at the top of your crate:
 //!
 //! ```ignore
-//! #![recursion_limit = "1024"];
+//! #![recursion_limit = "1024"]
 //! ```
 //!
 //! Again near the top of your crate, import the `error_chain` crate and its macros: