[libsrtp] libsrtp version 1.6.0 hase been released

Version 1.6.0 of libsrtp has now been released. This release restores compatibility between version 1 and version 2.1.0 and later.

From this point 1.5.x is effectively EOL and there will be no more changes to 1_5_x_throttle. It is strongly recommended for people currently using a 1.5.x release to move to the 1.6.0 release if they are unable to move the 2.1.0 release. The 1_6_x_throttle will only receive important security fixes.

Regards The libsrtp maintenance team.