Add CHANGELOG.md

Author: wavefrontshaping

CHANGELOG.md

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+## 0.4
+
+### Fixed
+
+* Corrected BatchNorm1d tensor size issue
+
+## 0.3
+
+## 0.2.1
+
+### Fixed
+* Correct bug causing ComplexBatchNorm to fail in eval mode
+* Correct behaviour of ComplexBatchNorm for track_running_stats=False
+
+### Added
+* ComplexAvgPool2d
+
+## 0.2
+
+Requires Pytorch version >= 1.7
+
+### Changed
+* Use complex64 tensors now supported by Pytorch version >= 1.7
+
+
+## 0.1
+
+Initial release
+
+### Fixed 
+* Correct memory leak with torch.nograd()