Fix spec_version generation
Fix spec_version generation

See ev3dev/ev3dev-lang#114

ensonic/ev3dev-lang-python,dwalton76/ev3dev-lang-python,rhempel/ev3dev-lang-python,ddemidov/ev3dev-lang-python-1,ensonic/ev3dev-lang-python-1,dwalton76/ev3dev-lang-python