Hotfix for CHANGELOG.md

For whatever reason, I made a release on the MkDocs branch, which messed up our CHANGELOG.
I apologize for that.
This PR, therefore, fixes the CHANGELOG to accurately reflect the state of changes made.

Author: ericmjl

CHANGELOG.md

@@ -2,7 +2,6 @@
 
 ## [Unreleased]
 -   [INF] Simplify a bit linting, use pre-commit as the CI linting checker. @Zeroto521
--   [ENH] Fix bug in `pivot_longer` for wrong output when `names_pattern` is a sequence with a single value. Issue #885 @samukweku
 -   [ENH] Deprecate `aggfunc` from `pivot_wider`; aggregation can be chained with pandas' `groupby`.
 -   [BUG] Fix conditional join issue for multiple conditions, where pd.eval fails to evaluate if numexpr is installed. #898 @samukweku
 -   [ENH] Added `case_when` to handle multiple conditionals and replacement values. Issue #736. @robertmitchellv
@@ -11,6 +10,16 @@
 -   [ENH] `expand_grid` returns a MultiIndex DataFrame, allowing the user to decide how to manipulate the columns. @samukweku
 
 
+## [v0.21.2] - 2021-09-01
+
+-   [ENH] Fix warning message in `coalesce`, from bfill/fill;`coalesce` now uses variable arguments. Issue #882 @samukweku
+-   [INF] Add SciPy as explicit dependency in `base.in`. Issue #895 @ericmjl
+-   [ENH] Fix bug in `pivot_longer` for wrong output when `names_pattern` is a sequence with a single value. Issue #885 @samukweku
+-   [ENH] Deprecate `aggfunc` from `pivot_wider`; aggregation can be chained with pandas' `groupby`.
+-   [BUG] Fix conditional join issue for multiple conditions, where pd.eval fails to evaluate if numexpr is installed. #898 @samukweku
+-   [INF] Simplify a bit linting, use pre-commit as the CI linting checker. @Zeroto521
+
+
 ## [v0.21.1] - 2021-08-29
 
 -   [DOC] Fix references and broken links in AUTHORS.rst. @loganthomas