Add messages entry for 0.4.2

Author: tomv564

messages.json

@@ -5,5 +5,6 @@
     "0.2.2": "messages/0.2.2.txt",
     "0.3.0": "messages/0.3.0.txt",
     "0.4.0": "messages/0.4.0.txt",
-    "0.4.1": "messages/0.4.1.txt"
+    "0.4.1": "messages/0.4.1.txt",
+    "0.4.2": "messages/0.4.2.txt"
 }

messages/0.4.2.txt

@@ -0,0 +1,12 @@
+=> 0.4.2
+
+Features:
+* Symbol highlighting (@rwols)
+* Polymer language server configuration (@rictic)
+* Support RustEnhanced syntax
+
+Major bug fixes:
+* JSON-RPC & protocol parsing fixes (@vogelsgesang)
+* Prevent completion failure if sortText was None.
+
+See https://github.com/tomv564/LSP/releases/tag/0.4.2 for full update details.