Support for StatsBase v0.34 and StatsModels v0.7

[AsafManela]

Now that MLBase supports the newer version of StatsBase it can be supported by Lasso too.

Also bumps compat for StatsModels to v0.7 which didn't really affect Lasso.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.05% ⚠️

Comparison is base (37994e9) 90.04% compared to head (dd8419f) 90.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   90.04%   90.00%   -0.05%     
==========================================
  Files           8        8              
  Lines        1215     1220       +5     
==========================================
+ Hits         1094     1098       +4     
- Misses        121      122       +1     

see 2 files with indirect coverage changes

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[AsafManela]

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