Fix typo in README.md

Author: nicoder

README.md

@@ -1,6 +1,6 @@
 jasmine-browser-runner runs your Jasmine specs in a browser. It's suitable for
 interactive use with normal browsers as well as running specs in CI builds
-using either headless browsers or with a remote Selenuium grid provider
+using either headless browsers or with a remote Selenium grid provider
 such as Saucelabs.
 
 # Getting started