update description

README.md

-# webots_run
-Isolated webots_run package from kaist_webots. Also _catkinized_ :)
-
-Code developed by David Butterworth.
-
+# coppeliasim_run
 
 ## Usage
-This package launches Webots _within_ a ROS node, so you can run it from a launch file.
-In order to work, it requires to include the Webots' directory in the `PATH`.
+This package runs coppeliasim _within_ a ROS node, so you can run it from a launch file.