Fix a typo in CHANGES.
NB CMakelists was in the repo at the time of the 1.3.3 release,
but didn't make it into the 1.3.3 dist target, so it can't be
said to be available for that release.
diff --git a/CHANGES b/CHANGES
index bce87d0..f36b45a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,6 @@
Version 1.3.3 (2017 November 7)
- * Fix and issue with corrupt continued packet handling.
+ * Fix an issue with corrupt continued packet handling.
* Update Windows projects and build settings.
* Remove Mac OS 9 build support.
