Fix incorrect method name (thanks matchu).

README.rdoc

@@ -71,7 +71,7 @@ Some utility methods are also available:
   Geocoder::Calculations.distance_between( 48.858205,2.294359,  40.748433,-73.985655 )
 
   # look up coordinates of some location (like searching Google Maps)
-  Geocoder.fetch_coordinates("25 Main St, Cooperstown, NY")
+  Geocoder::Lookup.coordinates("25 Main St, Cooperstown, NY")
 
   # find the geographic center (aka center of gravity) of objects or points
   Geocoder::Calculations.geographic_center([ city1, city2, city3, [40.22,-73.99], city4 ])