Mark completed items as DONE instead of using line-through
Mark completed items as DONE instead of using line-through

GitHub's flavor of asciidoc does not support "line-through" for
striking out text. Added explicit "DONE" indication instead.

ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan