py-pyobjc: update to 5.2

- update homepage
- change to depends_lib-append

python/py-pyobjc/Portfile

@@ -4,11 +4,8 @@ PortSystem          1.0
 PortGroup           python 1.0
 
 name                py-pyobjc
-version             5.1.2
-checksums           rmd160  b74806ee8b66a141a6f96303ecc56448808a1ccb \
-                    sha256  db8836da2401e63d8bdaff7052fdc6113b7527d12d84e58fe075e69ff590e8fd \
-                    size    794290
-revision            1
+version             5.2
+revision            0
 
 categories-append   devel
 license             MIT
@@ -23,14 +20,18 @@ long_description    The PyObjC project aims to provide a bridge between \
                     and the Objective-C programmer transparent access to \
                     Python based functionality.
 
-homepage            https://pythonhosted.org/pyobjc/
+homepage            https://pyobjc.readthedocs.io
 master_sites        pypi:p/pyobjc-core/
 distname            pyobjc-core-${version}
+checksums           rmd160  7509b54b44db3f1d5da4c1908ef38aef8d8acee3 \
+                    sha256  cd13a2e9be890064a6dd11db7790bbf38502350c532a9a9d05511abb8683b8ea \
+                    size    797936
 
-python.versions 27 34 35 36 37
+python.versions     27 34 35 36 37
 
 if {${name} ne ${subport}} {
-    depends_lib     port:libffi \
+    depends_lib-append \
+                    port:libffi \
                     port:py${python.version}-setuptools \
                     port:py${python.version}-py2app