docs(CONTRIBUTING): fix typo

Author: paaloeye

Diff for: CONTRIBUTING.md

@@ -8,5 +8,5 @@ We are always looking for the quality contributions and will be happy to accept
         * it should be easy to change a default template to a custom one
         * directives shouldn't manipulate DOM structure directly (when possible)
 * Please assure that you are submitting quality code, specifically make sure that:
-  * your directive has accompanying tests and all the tests are passing; don't hesitate to contact us ([email protected]) if you ned any help with unit testing
+  * your directive has accompanying tests and all the tests are passing; don't hesitate to contact us ([email protected]) if you need any help with unit testing
   * your PR doesn't break the build; check the Travis-CI build status after opening a PR and push corrective commits if anything goes wrong