Merge pull request #129 from megies/patch-1

fix docstring typo

Author: Jeff Whitaker

examples/testwmsimage.py

@@ -1,7 +1,7 @@
 """
 example showing how to use OWSlib to retrieve an image
 from a WMS server and display it on a map (using the
-wmsimage convienence method)
+wmsimage convenience method)
 """
 from mpl_toolkits.basemap import Basemap, pyproj
 from datetime import datetime