upgrade falkorlib

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
bump to version '0.2.0'

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'release/0.2.0' into devel

* release/0.2.0:
  bump to version '0.2.0'