Merge pull request #1127 from benjeffery/c-0-99-release-prep

C release prep

Author: mergify[bot]

c/CHANGELOG.rst

@@ -1,17 +1,13 @@
 ---------------------
-[0.99.9] - 2021-XX-XX
+[0.99.9] - 2021-01-22
 ---------------------
 
-**Breaking changes**
-
 **Features**
 
 - Add ``TSK_KEEP_UNARY_IN_INDIVIDUALS`` flag to simplify, which allows the user to
   keep unary nodes only if they belong to a tabled individual. This is useful for
   simplification in forwards simulations (:user:`hyanwong`, :issue:`1113`, :pr:`1119`).
 
-**Bugfixes**
-
 
 ---------------------
 [0.99.8] - 2020-11-27