Merge pull request #33 from rethab/patch-1

auto update is only available in new version

README.md

@@ -82,13 +82,14 @@ regularly update the cache.  Such an update can be run manually with:
 $ tldr --update
 ```
 
-Users of this client can enable automatic updates by running it with
-the option `--auto-update-interval DAYS` specified.  The client will
-then check whether the cached version of the tldr pages is older than
-`DAYS` days and perform an update in that case.  To enable this
-functionality permanently, users can put the line `alias tldr="tldr
---auto-update-interval DAYS"` in their shell configuration file
-(e.g. `.bashrc`, `.zshrc`) with the desired update interval specified.
+Starting with version `0.9.0`, users of this client can enable automatic 
+updates by running it with the option `--auto-update-interval DAYS`
+specified.  The client will then check whether the cached version of the
+tldr pages is older than `DAYS` days and perform an update in that case. 
+To enable this functionality permanently, users can put the line
+`alias tldr="tldr --auto-update-interval DAYS"` in their shell 
+configuration file (e.g. `.bashrc`, `.zshrc`) with the desired update
+interval specified.
 
 ## Snapshot