Change the mercurial minimum version
the obsstore api was added in mercurial 2.3.
I did _not_ tested with this version though, so we may have to
change it if issues are encountered.
    
        | author | Christophe de Vienne <cdevienne@gmail.com> | 
    
        | date | Fri, 21 Nov 2014 17:04:06 +0100 | 
    
    
        | parents | 676834353b0d | 
    
        | children | 16e0bcd4f854 | 
    
        | branches/tags | (none) | 
    
        | files | README.markdown | 
Changes
    
--- a/README.markdown	Wed Oct 29 14:49:08 2014 +0100
+++ b/README.markdown	Fri Nov 21 17:04:06 2014 +0100
@@ -4,7 +4,7 @@
 Installing
 ==========
 
-`hg-review` requires Mercurial 1.6+ and Python 2.5+. It requires a few other
+`hg-review` requires Mercurial 2.3+ and Python 2.5+. It requires a few other
 things too, but they're bundled with the extension so you don't need to worry
 about them.