Tiny tweaks in CHANGES.

CHANGES.md

@@ -7,11 +7,11 @@
   disappears. The command line switch `--suggest-ocamlfind` is deprecated
   and causes Menhir to print `false`.
 
-* Menhir is now built and installed by dune. This should make life easier
-  for developers: in particular, `make test` and `make speed` can be run
-  straight away and do not requiring installing Menhir first. This should
-  also make compilation much faster on multi-core machines. (Contributed
-  by Nicolás Ojeda Bär, to whom many thanks are due.)
+* Menhir is now built and installed by `dune`. This should make life easier
+  for Menhir's developers: in particular, `make test` and `make speed` can be
+  run straight away and do not requiring installing Menhir first. This should
+  also make compilation much faster on multi-core machines. (Contributed by
+  Nicolás Ojeda Bär, to whom many thanks are due.)
 
 ## 2019/09/24