Bump Stats version to 0.2.0, for changes to corrected flag in mainline julia.

* Also added 0.1.0 to track bugfixes for julia 0.1

cf. https://github.com/JuliaStats/Stats.jl/commit/ff07c5fdc37aaacfe0f4a6132bd2303bd294e0e6#commitcomment-2867275