py-bpython: correct fetch URL (fixes https://trac.macports.org/ticket/51502)

git-svn-id: https://svn.macports.org/repository/macports/trunk/dports@149061 d073be05-634f-4543-b044-5fe20cf6d1d6

python/py-bpython/Portfile

@@ -6,8 +6,12 @@ PortGroup               python 1.0
 PortGroup               select 1.0
 PortGroup               github 1.0
 
-github.setup            bpython bpython 0.15
-git.branch              ${version}-release
+# FIXME: bpython uses a version *suffix* instead of a *prefix*.
+# Add support to github portgroup for version suffix?
+github.setup            bpython bpython 0.15-release
+version                 0.15
+distname                ${name}-${version}
+
 name                    py-${name}
 platforms               darwin
 supported_archs         noarch