Fix minimum libtorrent-rasterbar version

as title

Author: Fale

INSTALL

@@ -14,7 +14,7 @@ qBittorrent - A BitTorrent client in C++ / Qt4
 
     - pkg-config executable
 
-    - libtorrent-rasterbar by Arvid Norberg (>= 1.0.0)
+    - libtorrent-rasterbar by Arvid Norberg (>= 1.0.6)
         -> http://www.libtorrent.net
         Be careful: another library (the one used by rTorrent) uses a similar name.
 
@@ -40,7 +40,7 @@ qBittorrent - A BitTorrent client in C++ / Qt4
 
     - pkg-config executable
 
-    - libtorrent-rasterbar by Arvid Norberg (>= v1.0.0)
+    - libtorrent-rasterbar by Arvid Norberg (>= v1.0.6)
         -> http://www.libtorrent.net
         Be careful: another library (the one used by rTorrent) uses a similar name.