updated changelog for 0.4.3.

Note: Bug #192 happened because Visual Studio, as observed with version
2005 to 2017, optimized several identical empty functions into one, but
the code used function pointer comparisons which led to false positives
and crashes.

README.md

@@ -35,6 +35,8 @@ Requirements:
 CHANGELOG
 
 0.4.3
+* Fixed Visual Studio optimized builds. (Bug #192, function pointer
+  issue.)
 * Fixed a thinko in one of the buffer size checks added in v0.4.2.
 * Fix possible out of bounds reads in sysex commands. (Bug #190).