Update: devel/py-altgraph 0.15 -> 0.16.1

Pretty trivial update of py-altgraph to 0.16.1

The 0.16 and 0.16.1 changelogs indicate "Added LICENSE file" and
"explicity mark Python 3.7 as supported in wheel metadata". I
tested its consumer devel/py-modulegraph anyway and the tests
came out the same for both the original 0.15 and the updated
0.16.1 versions.

--Kurt

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/py-altgraph/Makefile,v
retrieving revision 1.15
diff -u -p -r1.15 Makefile
--- Makefile 17 Feb 2018 09:36:36 -0000 1.15
+++ Makefile 25 Feb 2019 05:24:09 -0000
@@ -2,7 +2,7 @@

COMMENT= Python graph (network) package

-MODPY_EGG_VERSION = 0.15
+MODPY_EGG_VERSION = 0.16.1
DISTNAME= altgraph-${MODPY_EGG_VERSION}
PKGNAME= py-${DISTNAME}

Index: distinfo
===================================================================
RCS file: /cvs/ports/devel/py-altgraph/distinfo,v
retrieving revision 1.7
diff -u -p -r1.7 distinfo
--- distinfo 17 Feb 2018 09:36:36 -0000 1.7
+++ distinfo 25 Feb 2019 05:24:09 -0000
@@ -1,2 +1,2 @@
-SHA256 (altgraph-0.15.tar.gz) = /Ci5hqaP3o0/8ObWuj+90s1WLRHUXvfHc1+9gmye7C4=
-SIZE (altgraph-0.15.tar.gz) = 589882
+SHA256 (altgraph-0.16.1.tar.gz) = 3fUyABcUe6e4EBmOC2YZvXtVY6oDTaOIzqhUa4d/mww=
+SIZE (altgraph-0.16.1.tar.gz) = 499316