Use warnings module to warn when psycopg2 is not installed

Author: yohanboniface

postgis/geometry.py

@@ -1,8 +1,10 @@
+import warnings
+
 try:
     # Do not make psycopg2 a requirement.
     from psycopg2.extensions import ISQLQuote
 except ImportError:
-    print('psycopg2 not installed')
+    warnings.warn('psycopg2 not installed', ImportWarning)
 
 
 from .ewkb import Reader, Typed, Writer

setup.py

@@ -46,7 +46,7 @@ def list_modules(dirname):
     cmdclass = {'build_ext': build_ext}
 
 
-VERSION = (1, 0, 3)
+VERSION = (1, 0, 4)
 
 setup(
     name='postgis',