Improve readme

Author: jperelli

README.md

@@ -1,6 +1,6 @@
 # osm-static-maps
 
-Open source clone of Google static map service.
+Openstreetmap static maps is an open source clone of google static map service.
 
 Here you have a [demo](http://osm-static-maps.herokuapp.com/?geojson=[{"type":"Feature","properties":{"party":"Republican"},"geometry":{"type":"Polygon","coordinates":[[[-104.05,48.99],[-97.22,48.98],[-96.58,45.94],[-104.03,45.94],[-104.05,48.99]]]}},{"type":"Feature","properties":{"party":"Democrat"},"geometry":{"type":"Polygon","coordinates":[[[-109.05,41.00],[-102.06,40.99],[-102.03,36.99],[-109.04,36.99],[-109.05,41.00]]]}}]&height=300&width=300 "Just what I wanted!"). Also a [dynamic version](http://osm-static-maps.herokuapp.com/dynamic?geojson=[{"type":"Feature","properties":{"party":"Republican"},"geometry":{"type":"Polygon","coordinates":[[[-104.05,48.99],[-97.22,48.98],[-96.58,45.94],[-104.03,45.94],[-104.05,48.99]]]}},{"type":"Feature","properties":{"party":"Democrat"},"geometry":{"type":"Polygon","coordinates":[[[-109.05,41.00],[-102.06,40.99],[-102.03,36.99],[-109.04,36.99],[-109.05,41.00]]]}}]&height=300&width=300 "Wow it gets even better!!") of the demo, for testing purposes.