added 0.49.4 release notes

Author: Peter Szabo

debian/changelog

@@ -1,3 +1,12 @@
+sam2p (0.49.4) trusty; urgency=low
+
+  * fixed memory use bugs and vulnerabilities, e.g. these:
+    https://github.com/pts/sam2p/issues/14
+  * improved compatibility with new gcc, clang and perl
+  * improved Makefile automation
+
+ -- Peter Szabo <pts@fazekas.hu>  Wed, 27 Sep 2017 17:39:12 +0200
+
 sam2p (0.49.3) lucid; urgency=low
 
   * Added 36 changes in total.