Removed warning in LICENSE.txt about PhysicsFS 0.1.9 being LGPL code.

The license was changed in 1.0.0, on January 8th, 2004. I think it's time to
stop worrying about a prerelease version from almost 14 years ago.

LICENSE.txt

@@ -21,13 +21,3 @@
 
        Ryan C. Gordon <icculus@icculus.org>
 
-
-
-
-Notes, separate from the license. This is not legal advice.
-
-Versions of PhysicsFS prior to 0.1.9 are licensed under the GNU Lesser General
- Public License, which restricts you significantly more. For your own safety,
- please make sure you've got 0.1.9 or later if you plan to use physfs in a
- commercial or closed-source project.
-