Bump version to v0.1.3.
Bump version to v0.1.3.

chrise86/state_machines_activerecord_rspec,vanburg/state_machines_activerecord_rspec,state-machines/state_machines-rspec,chrise86/state_machines_activerecord_rspec,vanburg/state_machines_activerecord_rspec,modocache/state_machine_rspec