changes: document recent changes

Author: John Garrett

CHANGES.md

@@ -1,3 +1,25 @@
+v0.0.3 (Jun 24, 2021)
+=====================
+
+- Waveguide package:
+	- Propagation module:
+		- add conductivity_4k function to calculate conductivity at cryogenic temperatures using the anomalous skin effect model
+	- Cavity module:
+		- add ability to correct for S11 phase from iris or shunt susceptance
+		- add function to estimate resonance order
+	- Utility module:
+		- add linear10, linear20 functions
+	- Components module:
+		- add thin_iris function to calculate the theoretical S-parameters of a thin iris
+- Examples:
+	- add simple waveguide example
+	- add example of a WR-6.5 waveguide loaded with HDPE
+	- add example comparing HFSS to theory
+	- add example comparing conductor and dielectric loss
+- Tests:
+	- test against Scikit-RF
+	- add example 4.14 in Gustrau, add test for lossy cavity
+
 v0.0.2 (Mar 04, 2021)
 =====================