README.md: fix a couple of typos
-rw-r--r-- 12 .gitignore
-rw-r--r-- 57 Makefile
-rw-r--r-- 3460 README.md
-rw-r--r-- 439 TODO
drwxr-xr-x - contrib
-rwxr-xr-x 3170 create_test_videofont.py
drwxr-xr-x - examples
-rwxr-xr-x 1447 vidi-player.py
-rwxr-xr-x 1460 vidi-sampler.py
-rwxr-xr-x 3548 vidi-timeline.py
drwxr-xr-x - vidi