README.md: Fix some "markdownlint" warnings
-rw-r--r-- 34 AUTHORS
-rw-r--r-- 17987 COPYING
-rw-r--r-- 274 Makefile
-rw-r--r-- 8322 README.md
drwxr-xr-x - bin
drwxr-xr-x - etc
drwxr-xr-x - examples
drwxr-xr-x - lib