Update Source0 address

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>

el/mediaproxy-ng.spec

@@ -6,7 +6,7 @@ Summary:	The Sipwise NGCP mediaproxy-ng
 Group:		System Environment/Daemons
 License:	GPLv3
 URL:		https://github.com/sipwise/mediaproxy-ng
-Source:		%{name}-%{version}.tar.gz
+Source0:	https://github.com/sipwise/mediaproxy-ng/archive/%{version}/%{name}-%{version}.tar.gz
 Conflicts:	%{name}-kernel < %{version}
 BuildRoot:	%(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)