changed method flag to be a boolean

README.md

@@ -31,6 +31,8 @@ The following functions are supported:
   }
   ```
 
+  Note that `geometry` must contain at least two points.
+
 - DELETE `/api/streets/<streetname>`: Delete a street
 
   Deletes the street with the given name.
@@ -63,6 +65,6 @@ The following functions are supported:
       "x": int,
       "y": int
     },
-    "method": "Backend" | "Database" | "PostGIS" // Optional, default is "Backend"
+    "usePostGIS": bool // Optional, default is 'false'
   }
   ```