Lib: Rename msg method to message in Worker module (#1037)

* Fix the message method in Worker module

* Update CHANGES.ml

Author: ngoguey

CHANGES.md

@@ -9,6 +9,7 @@
 * Compiler: fix code generation for recursive function under for-loops (#1009)
 * Compiler: the jsoo compiler compiled to javascript was not behaving correctly
             when parsing constant in the from the bytecode
+* Lib: Rename msg to message in Worker (#1037)
 
 # 3.6.0 (2020-04-26) - Lille
 ## Features/Changes

lib/js_of_ocaml/worker.ml

@@ -38,7 +38,7 @@ and errorEvent =
   object
     inherit event
 
-    method msg : js_string t readonly_prop
+    method message : js_string t readonly_prop
 
     method filename : js_string t readonly_prop
 

lib/js_of_ocaml/worker.mli

@@ -46,7 +46,7 @@ and errorEvent =
   object
     inherit event
 
-    method msg : js_string t readonly_prop
+    method message : js_string t readonly_prop
 
     method filename : js_string t readonly_prop