You can check which version of the package is currently installed with the rc_version program. The 2018-06-17 stable image ships with 0.4.4

debian@beaglebone:~$ rc_version

0.4.4

Beginning with the librobotcontrol 1.0.0 release, it will adhere to semantic versioning. To access the version number of the library see the version module and its associated macros and functions.