Add Requirements section in README (link to wiki).

Fixes #297

diff --git a/README.md b/README.md
old mode 100644 (file)
new mode 100755 (executable)
index b3dbaf5..5743ec4
--- a/README.md
+++ b/README.md
@@ -55,9 +55,11 @@ Password: `demo`
  * [Bugs/Feature requests/Discussion](https://github.com/shaarli/Shaarli/issues/)
 
 
-## Installing
+## Requirements
+
+Check the [Server requirements](https://github.com/shaarli/Shaarli/wiki/Server-requirements) wiki page.
 
-Shaarli requires PHP 5.3. `php-gd` is optional and provides thumbnail resizing.
+## Installing
 
  * Download the latest stable release from https://github.com/shaarli/Shaarli/releases
  * Unpack the archive in a directory on your web server