V0.19.3 (#651)

* v0.19.3 * docs on left truncation and timeline * more
CamDavidsonPilon · Feb 25, 2019 · 36d3191 · 36d3191
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diff --git a/CHANGELOG.md b/CHANGELOG.md
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 ### Changelog
 
+#### 0.19.3
+
+##### New features
+ - new AFT models: `LogNormalAFTFitter` and `LogLogisticAFTFitter`.
+ - AFT models now accept a `weights_col` argument to `fit`.
+ - Robust errors (sandwich errors) are now avilable in AFT models using the `robust=True` kwarg in `fit`.
+ - Performance increase to `print_summary` in the `CoxPHFitter` and `CoxTimeVaryingFitter` model.
+
 #### 0.19.2
 
 ##### New features