community/postgresql-pglogical: fix license

PostgreSQL is OSI-approved license:

  * https://opensource.org/licenses/PostgreSQL
  * https://spdx.org/licenses/PostgreSQL.html

community/postgresql-pglogical/APKBUILD

@@ -4,11 +4,11 @@
 pkgname=postgresql-pglogical
 _pkgname=pglogical
 pkgver=2.1.0
-pkgrel=2
+pkgrel=3
 pkgdesc="Logical Replication extension for PostgreSQL"
 url="https://2ndquadrant.com/en/resources/pglogical/"
 arch="all"
-license="custom"
+license="PostgreSQL"
 depends="postgresql"
 makedepends="libedit-dev libxml2-dev postgresql-dev zlib-dev"
 source="http://packages.2ndquadrant.com/pglogical/tarballs/$_pkgname-$pkgver.tar.bz2