Merge pull request #85 from rhysd/fix-issue-84

Update license description (fixes #84)

Author: mattn

LICENSE

@@ -1,2 +1,4 @@
-To the extent possible under law, Yukihiro Nakadaira has waived all copyright and 
-related or neighboring rights to VimL parser.
+All files in this repository are distributed in the Public Domain. To the extent
+possible under law, Yukihiro Nakadaira (original author) has waived all copyright
+and related or neighboring rights to VimL parser.
+Please utilize this software at your own risk.