CHANGELOG in pdf-reader-2.3.0 vs CHANGELOG in pdf-reader-2.4.0

@@ -1,4 +1,13 @@
+v2.4.0 (21st November 2019)
+- Optimise overlapping characters code introduced in 2.3.0. Text extraction of pages with
+  thousands of characters is still slower than it was in 2.2.1, but it might tolerable
+  for now. See https://github.com/yob/pdf-reader/pull/308 for details.
+- Implement very basic font substitution for Type1 and TrueType fonts that aren't embedded
+- Remove PDF::Hash class. It's been deprecated since 2010, and it's hard to believe anyone
+  is still using it.
+- Several small bug fixes
+
 v2.3.0 (7th November 2019)
 - Text extraction now makes an effort to skip duplicate characters that overlap, a
   common approach used for a fake "bold" effect, This will make text extraction a bit
   slower - if that turns out to be an issue I'll look into further optimisations or
   provide a toggle to turn it off