Rubocop-sketchup 1.0.0 released

This is a maintenance release to support rubocop 1.x. Since rubocop is now on v1 and using semantic versioning the gem has updated its rubocop dependency to be < 2.0. This should mean that rubocop-sketchup should only need to update when it add new features of its own. Earlier we have to test every single rubocop version for compatibility.