Update messages.json

Author: skuroda

messages.json

@@ -15,5 +15,6 @@
     "1.2.1": "messages/1.2.1.txt",
     "1.3.0": "messages/1.3.0.txt",
     "1.4.0": "messages/1.4.0.txt",
-    "1.4.3": "messages/1.4.3.txt"
+    "1.4.3": "messages/1.4.3.txt",
+    "1.5.0": "messages/1.5.0.txt"
 }