spec: Update for some review comments

https://bugzilla.redhat.com/show_bug.cgi?id=1323214

Closes: #18
Approved by: cgwalters

packaging/git-evtag.spec.in

@@ -1,9 +1,9 @@
 Summary: Strong GPG verification of git tags
 Name: git-evtag
-Version: 2015.1
+Version: 2016.1
 Release: 1%{?dist}
 #VCS: https://github.com/cgwalters/git-evtag
-Source0: %{name}-%{version}.tar.xz
+Source0: https://github.com/cgwalters/git-evtag/archive/v2016.1.zip#/%{name}-%{version}.zip
 License: LGPLv2+
 URL: https://github.com/cgwalters/git-evtag
 # For autosetup
@@ -14,8 +14,12 @@ BuildRequires: autoconf automake libtool
 BuildRequires: pkgconfig(libgit2)
 BuildRequires: pkgconfig(gio-2.0)
 
+Requires: git
+Requires: gnupg2
+
 %description
-%{summary}
+git-evtag wraps "git tag" functionality, adding stronger checksums
+that cover the complete content.
 
 %prep
 %autosetup -Sgit
@@ -29,5 +33,5 @@ make %{?_smp_mflags}
 make install DESTDIR=%{buildroot} INSTALL="install -p -c"
 
 %files
-%doc COPYING README.md
+%license COPYING
 %{_bindir}/%{name}