Update CHANGES for 2.0.7

Author: sim642

CHANGES.md

@@ -1,8 +1,11 @@
 ## 2.0.7
+* Add `_Float16` type support (#190, #193).
+* Add C23 `alignof` and `alignas` support (#189, #191).
 * Add initializer support for anonymous struct in union (#176, #184).
 * Fix enumerator printing (#185).
 * Remove global state from `Pretty` (#187).
 * Remove OCaml <4.12 support (#180, #181).
+* Use `gnu11` standard in most tests (#188, #192).
 
 ## 2.0.6
 * Optimize `Pretty.text` (#169, #177).