Update README to explain the default location. Fixed #6

Author: Torann

README.md

@@ -70,11 +70,17 @@ array (
     "city"         => "New Haven",
     "state"        => "CT",
     "postal_code"  => "06510",
-    "lat"          => 41.28,
+    "lat"          => 41.28,
     "lon"          => -72.88,
-    "timezone"     => "America/New_York"
+    "timezone"     => "America/New_York"
+    "default"      => false
 );
-```
+```
+
+#### Note
+
+In the case that a location is not found the fallback location will be returned with the `default` parameter set to `true`. In a future release I'll make the default location customizable. For not it is New Haven, CT.
+
 ## Services