docs: Removed misleading text (#194)

"This API is based on the W3C Geolocation API Specification, and only executes on devices that don't already provide an implementation."

is misleading because it sounds like you do not need the plugin if the browser has geolocation support,
however, the plugin still handles permissions regardless if it provides
a geolocation implementation or not.

README.md

@@ -39,8 +39,7 @@ device's actual location.
 > To get a few ideas, check out the [sample](#sample) at the bottom of this page or go straight to the [reference](#reference) content.
 
 This API is based on the
-[W3C Geolocation API Specification](http://dev.w3.org/geo/api/spec-source.html),
-and only executes on devices that don't already provide an implementation.
+[W3C Geolocation API Specification](http://dev.w3.org/geo/api/spec-source.html).
 
 __WARNING__: Collection and use of geolocation data
 raises important privacy issues.  Your app's privacy policy should