2014-02-09: readme: fix grammar (servers who → servers which)

readme: fix grammar (servers who → servers which)

diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -4,7 +4,7 @@ Create and/or upload a static copy of th
 
 You can get it via `hg clone http://draketo.de/proj/hgsite/`
 
-The main goal is sharing code with Mercurial on servers who only offer
+The main goal is sharing code with Mercurial on servers which only offer
 FTP access and statically served files, while providing the same
 information as hg serve and full solutions like bitbucket and
 gitorious (naturally without the interactivity).