sxiv-git: add provides & replaces

srcpkgs/sxiv-git/template

@@ -1,7 +1,7 @@
 # Template file for 'sxiv-git'
 pkgname=sxiv-git
 version=20140531
-revision=1
+revision=2
 build_style=gnu-makefile
 makedepends="libX11-devel imlib2-devel giflib-devel desktop-file-utils"
 depends="desktop-file-utils"
@@ -9,6 +9,8 @@ short_desc="Simple X Image Viewer"
 maintainer="Ypnose <linuxienATlegtuxDOTorg>"
 license="GPL-2"
 homepage="https://github.com/muennich/sxiv"
+provides="sxiv-${version}_${revision}"
+replaces="sxiv>=0"
 
 do_fetch() {
 	local url="git://github.com/muennich/sxiv"