postgis 2.4.0

This is a prerequisite for upgrading to postgresql 10.0, but should
still be backwards compatible until postgres 9.3.

Closes #19113.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/postgis.rb

@@ -1,8 +1,8 @@
 class Postgis < Formula
   desc "Adds support for geographic objects to PostgreSQL"
   homepage "https://postgis.net/"
-  url "http://download.osgeo.org/postgis/source/postgis-2.3.2.tar.gz"
-  sha256 "e92e34c18f078a3d1a2503cd870efdc4fa9e134f0bcedbbbdb8b46b0e6af09e4"
+  url "http://download.osgeo.org/postgis/source/postgis-2.4.0.tar.gz"
+  sha256 "02baa90f04da41e04b6c18eedfda53110c45ae943d4e65050f6d202f7de07d29"
 
   bottle do
     cellar :any
@@ -117,11 +117,11 @@ def install
   def caveats
     <<-EOS.undent
       To create a spatially-enabled database, see the documentation:
-        https://postgis.net/docs/manual-2.2/postgis_installation.html#create_new_db_extensions
+        https://postgis.net/docs/manual-2.4/postgis_installation.html#create_new_db_extensions
       If you are currently using PostGIS 2.0+, you can go the soft upgrade path:
         ALTER EXTENSION postgis UPDATE TO "#{version}";
       Users of 1.5 and below will need to go the hard-upgrade path, see here:
-        https://postgis.net/docs/manual-2.2/postgis_installation.html#upgrading
+        https://postgis.net/docs/manual-2.4/postgis_installation.html#upgrading
 
       PostGIS SQL scripts installed to:
         #{opt_pkgshare}