doc: fixed article usage in README.

added a the because it sounded weird.

PR-URL: https://github.com/iojs/io.js/pull/29
Reviewed-by: Mikeal Rogers <mikeal.rogers@gmail.com>
Reviewed-by: Chris Dickinson <christopher.s.dickinson@gmail.com>

README.md

@@ -7,7 +7,7 @@ releases, and contributorship are under an
 [open governance model](./CONTRIBUTING.md#governance).
 
 We intend to release, with increasing regularity, releases which are
-compatible with npm ecosystem that has been built to date for node.js.
+compatible with the npm ecosystem that has been built to date for node.js.
 
 ### To build: