More updates to the CHANGELOG for the 6.4.1 release

Author: blnicho

Diff for: CHANGELOG.txt

@@ -17,6 +17,7 @@ Pyomo 6.4.1    13 May 2022
   - Add indices to ComponentData objects (#2351)
   - Ignore SetOf, BuildAction, and BuildCheck when checking units (#2366)
   - Improve support for absolute value in differentiation and FBBT (#2347)
+  - Allow relative tolerance when comparing unit dimensionality (#2395)
 - Solver Interfaces
   - Fix bug in GLPK solver plugin (#2348)
   - Update BARON solution parser (#2367)
@@ -36,6 +37,7 @@ Pyomo 6.4.1    13 May 2022
   - APPSI: Add tests for named expressions (#2392)
   - incidence_analysis: Add option to ignore inequality constraints in 
     IncidenceGraphInterface (#2350)
+  - MC++: Update interface tests (#2400)
   - MindtPy: Add quadratic_strategy option to pass quadratic constraints
     or objectives to MIP solvers (#2338)
   - Parmest: Skip tests when seaborn and matplotlib are missing (#2394)