gis/postgis: Wrap README at 72 columns.

Signed-off-by: B. Watson <yalhcru@gmail.com>

gis/postgis/README

@@ -1,7 +1,7 @@
-PostGIS adds support for geographic objects to the PostgreSQL object-relational
-database. In effect, PostGIS "spatially enables" the PostgreSQL server,
-allowing it to be used as a backend spatial database for geographic information
-systems (GIS).
+PostGIS adds support for geographic objects to the PostgreSQL
+object-relational database. In effect, PostGIS "spatially enables"
+the PostgreSQL server, allowing it to be used as a backend spatial
+database for geographic information systems (GIS).
 
 SFCGAL is an optional dependency for advanced 3D support.