The port only supports python 2.7

Fix pkg-descr while I'm here.

net/py-ldap0/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	ldap0
 PORTVERSION=	0.0.60
+PORTREVISION=	1
 CATEGORIES=	net python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -11,11 +12,12 @@ COMMENT=	Python module package for implementing LDAP clients
 
 LICENSE=	PSFL
 
-MAKE_ENV+=	INCLUDES=${LOCALBASE}/include
-WANT_OPENLDAP_SASL=yes
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyasn1-modules>=0.2.1:devel/py-pyasn1-modules@${PY_FLAVOR}
 
-USES=		python
+MAKE_ENV+=	INCLUDES=${LOCALBASE}/include
+WANT_OPENLDAP_SASL=yes
+
+USES=		python:2.7
 USE_OPENLDAP=	yes
 USE_PYTHON=	autoplist distutils
 

net/py-ldap0/pkg-descr

@@ -1,6 +1,11 @@
-ldap3 is a pure Python LDAP 3 client library strictly conforming to RFC4511
-released under the LGPL v3 open source license. RFC4511 is the current LDAP
-specification (June 2006) from IETF and obsoletes the previous LDAP RFCs
-2251, 2830, 3771 (December 1997)
+ldap0 provides an object-oriented API to access LDAP directory servers from
+Python programs. Mainly it wraps the OpenLDAP 2.x libs for that purpose.
+Additionally the package contains Python modules:
+- parsing and producing LDIF
+- handle LDAPURLs
+- parse and handle LDAPv3 subschema
+- LDAPv3 extended operations and controls
+- automatic tests with OpenLDAP server This package is a non-compatible fork of
+  python-ldap and therefore uses the separate module name-space 'ldap0'.
 
-WWW: https://github.com/cannatag/ldap3
+WWW: https://pypi.org/project/ldap0/#description