Update CHANGELOG.md (pre 2023 Hack)

This brings the change log up-to-date with all noteable changes to Rayleigh that were applied prior to the 2023 hackathon.

CHANGELOG.md

@@ -11,9 +11,17 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 - Rayleigh's configure script now supports the MKL package provided by the Debian and Ubuntu package repositories.  This feature is accessed by invoking the -debian-mkl flag when running configure.  \[Philipp Edelmann; 9-14-2022; [#386](https://github.com/geodynamics/Rayleigh/pull/386)\]
 
-- Rayleigh's equation set can now be extended to evolve multiple passive and/or active scalar fields.  \[Cian Wilson and Nick Featherstone; 11-22-2022; [#408](https://github.com/geodynamics/Rayleigh/pull/408); 12-2-2022 [#415](https://github.com/geodynamics/Rayleigh/pull/408)\]
+- Rayleigh's equation set can now be extended to evolve multiple passive and/or active scalar fields.  \[Cian Wilson, Nick Featherstone and Loren Matilsky; 11-22-2022; [#408](https://github.com/geodynamics/Rayleigh/pull/408); 12-2-2022 [#415](https://github.com/geodynamics/Rayleigh/pull/408)\; 1-5-2023 [#429](https://github.com/geodynamics/Rayleigh/pull/429) 1-30-2023 [#442](https://github.com/geodynamics/Rayleigh/pull/442)]
 
 - A new Docker image of Rayleigh, based on Ubuntu Jammy, is now generated whenever a PR is merged into master or a new release is created.  \[Rene Gassmoeller and Philipp Edelmann; 9-14-2022 and 9-15-2022; [#385](https://github.com/geodynamics/Rayleigh/pull/385), [#387](https://github.com/geodynamics/Rayleigh/pull/387), [#391](https://github.com/geodynamics/Rayleigh/pull/391), [#392](https://github.com/geodynamics/Rayleigh/pull/392) ]
+
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+- Custom profiles for the background dSdr and dTdr can now be specified when the *with_custom_reference* flag is set to True.  \[Nick Featherstone; 1-5-2023; [#416](https://github.com/geodynamics/Rayleigh/pull/416)\]
+
+- A new nondimensional polytropic reference state is now accessible by specifying reference_type=5. \[Loren Matilsky; 6-14-2023; [#450](https://github.com/geodynamics/Rayleigh/pull/450)\]
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+- The acknowledgement section of the documentation was updated to reflect the new CIG grant number (NSF-2149126) \[Lorraine Hwang; 5-1-2023; [#454](https://github.com/geodynamics/Rayleigh/pull/454)\]
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 ### Changed
 - plot_Shell_Slices.py now generates a Mollweide plot. \[Nick Nelson; 9-12-2022; [#372](https://github.com/geodynamics/Rayleigh/pull/372)\]
 
@@ -25,6 +33,9 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Fixed
 - plot_G_Avgs.py now correctly handles multiple files containing differing numbers of timesteps \[Philipp Edelmann; 9-13-2022; [#383](https://github.com/geodynamics/Rayleigh/pull/383)\]
 
+- Several bugs were fixed that prevented Rayleigh constants and functions from being properly reflected in the equation_coefficients file in some instances. \[Loren Matilsky; 1-30-2023, [#443](https://github.com/geodynamics/Rayleigh/pull/443); 3-29-2023, [#447](https://github.com/geodynamics/Rayleigh/pull/447);\]
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+- The documentation now properly reflects the fact that the constant c_5 is appears in front of the viscous heating term. \[Loren Matilsky; 1-31-2023; [#444](https://github.com/geodynamics/Rayleigh/pull/444)\]
 
 ## [1.1.0] - 4-29-2022
 ### Added