Compilation fails on Mac

Compilation fails because of `-rpath=/usr/local/lib` in this [makefile](https://github.com/MellowYarker/Observer/blob/master/src/Makefile). Unfortunately, the path is needed so ld can link *libwebsockets* to the `reader` prorgam.

To fix the error, just remove `-Wl, -rpath=/usr/local/lib` from the *reader* target in the makefile I linked above.