Bumped up the version to 0.5.3.
Bumped up the version to 0.5.3.

johannrudi/libsc,cburstedde/libsc,johannrudi/libsc,johannrudi/libsc,cburstedde/libsc,johannrudi/libsc,cburstedde/libsc,cburstedde/libsc,cburstedde/libsc,johannrudi/libsc