Bug 1272049 - Generalize vagrant and vbox install requirements

docs/installation.rst

@@ -12,7 +12,7 @@ Prerequisites
 -------------
 
 * If you are new to Mozilla or the A-Team, read the `A-Team Bootcamp`_.
-* Install Git_, Virtualbox_ and Vagrant_ 1.5+ (recent versions recommended).
+* Install Git_, Virtualbox_ and Vagrant_ (latest versions recommended).
 * Clone the `treeherder repo`_ from Github.
 * Windows only: Ensure MSYS ssh (ships with Git for Windows) is on the PATH, so Vagrant can find it (using PuTTY is more hassle).