shapely==1.6.4.post2 should have Python 3.7 support

Author: jonmmease

tox.ini

@@ -64,7 +64,7 @@ deps=
     optional: jupyter==1.0.0
     optional: pandas==0.19.2
     optional: scipy==0.18.1
-    optional: shapely==1.6.4
+    optional: shapely==1.6.4.post2
     optional: geopandas==0.3.0
     optional: pyshp==1.2.10