docs(README): fix example failed

"https://google.com" title is "Google" not "google"

Author: amowu

README.md

@@ -114,7 +114,7 @@ Feature: The Facebook
   @focus
   Scenario: Opening a social network page
     Given I open Google page
-    Then I see "google" in the title
+    Then I see "Google" in the title
 ```
 
 *The @focus tag is not necessary, but we want to you to notice it so you look it up below. **It will speed up your workflow significantly**!*