v0.9.1

[Breaking Changes]

• PR #1453: SlicingClassifier renamed to SliceAwareClassifier

[Added]

• PR #1451: add heuristic for breaking symmetry in multiple label model optima case
• PR #1442: integration test for MultitaskClassifier

[Changed]

• PR #1444: fix label model weight clamping behavior
• PR #1445: fix JSON log writer
• PR #1447: fix correct/incorrect count bug in LFAnalysis
• PR #1428, #1449: catch invalid label model inputs
• PR #1441: make inputs to Scorer.score optional