Remove unprintable 0x0C from license text

GitHub doesn't show 0x0C in file changes.
To confirm use `grep -C1 -P "\x0C" ./COPYING`

Looks like this:
![0x0C](https://f.cloud.github.com/assets/1910559/143578/0bbb5bc2-73b4-11e2-8c91-781c8e454050.png)