rcssserver-15.6.0

[15.6.0]

• Change the default value of server::dash_angle_step from 45.0 to
  1.0. This change means players can dash to almost any direction.

rcssserver-15.5.0

[15.5.0]

• Fix build problems on Ubuntu 18.04. Replace all auto_ptr variables
  with unique_ptr or shared_ptr. Now, rcssserver requires c++14.

rcssserver-15.4.0

[15.4.0]

• Improvement of the referee. When two or more players kick/tackle
  the ball in the same cycle, the last kicker is the one that
  provided higher acceleration to the ball and not the one that sent
  the last kick/tackle command to the server. Thanks go to Nader
  Zare for providing the patch.

rcssserver-15.3.0

[15.3.0]

• Fixed bison3 build problems. Supported Ubuntu 14.04.