[FIX] Stop advertising support for weights in LogisticRegression.

[sstanovnik]

The liblinear solver does not support weights in SKL, even though the parameter is there. Override the property to prevent errors.

[codecov-io]

Current coverage is 87.91%

Merging #1448 into master will decrease coverage by <.01%

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[lanzagar]

Since codecov is also complaining, you might want to leave a test for logreg (and the new one with linreg replacing the previous one).

assertFalse(LogisticRegressionLearner().supports_weights, ...)
and maybe also assert that learning with weights would raise the exception (so that the override is justified).

[astaric]

+1 for second assert, this way we will get a failing test if (when) liblinear starts accepting weights.