version 0.5.5 -> 0.5.6, update changelog

Author: shanemcq18

docs/source/opinf/changelog.md

@@ -5,6 +5,17 @@
 New versions may introduce substantial new features or API adjustments.
 :::
 
+## Version 0.5.6
+
+Added public templates to `opinf.operators`:
+
+- `OperatorTemplate` for general nonparametric operators.
+- `OpInfOperator` for nonparametric operators that can be learned through Operator Inference (operator matrix times data vector structure).
+- `ParametricOperatorTemplate` for general parametric operators.
+- `ParametricOpInfOperator` for parametric operators that can be learned through Operator Inference.
+
+Also added `opinf.ddt.InterpolationDerivativeEstimator` and made various improvements to the API documentation.
+
 ## Version 0.5.5
 
 Changes to the `opinf.lstsq` API and improvements to the documentation.

src/opinf/__init__.py

@@ -7,7 +7,7 @@
     https://github.com/Willcox-Research-Group/rom-operator-inference-Python3
 """
 
-__version__ = "0.5.5"
+__version__ = "0.5.6"
 
 from . import (
     basis,