Update for rpc_spec release and update changelog

Author: Henigan

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "generator/rpc_spec"]
 	path = generator/rpc_spec
 	url = https://github.com/smartdevicelink/rpc_spec.git
-	branch = develop
+	branch = master

CHANGELOG.md

@@ -51,6 +51,8 @@
 
 ## Bug Fixes:
 
+- [Multiframe encryption is not implemented correctly](https://github.com/smartdevicelink/sdl_java_suite/issues/1642)
+
 - [Empty string bug with Menu Cell](https://github.com/smartdevicelink/sdl_java_suite/issues/1623)
 
 - [CRC is not set for PutFile in FileManager](https://github.com/smartdevicelink/sdl_java_suite/issues/1622)
@@ -91,5 +93,8 @@
 
 - [BitConverter NullPointerExeptions](https://github.com/smartdevicelink/sdl_java_suite/issues/193)
 
+- [HelloSDL JavaEE 5.1 updates](https://github.com/smartdevicelink/sdl_java_suite/issues/1639)
+
+