add news entry

NEWS.md

@@ -14,9 +14,9 @@ New language features
 Language changes
 ----------------
 
-  * The default color for info messages has been changed from blue to cyan.
-    This can be changed back to the original color by setting the environment variable `JULIA_INFO_COLOR` to `"blue"`.
-    One way of doing this is by adding `ENV["JULIA_INFO_COLOR"] = :blue` to the `.juliarc.jl` file.
+  * The default color for info messages has been changed from blue to cyan and for warning messages from red to yellow.
+    This can be changed back to the original colors by setting the environment variables `JULIA_INFO_COLOR` to `"blue"` and `JULIA_WARN_COLOR` to `"red"`.
+    One way of doing this is by adding for example `ENV["JULIA_INFO_COLOR"] = :blue` and `ENV["JULIA_WARN_COLOR"] = :red` to the `.juliarc.jl` file.
     For more information regarding customizing colors in the REPL, see this [manual section]( http://docs.julialang.org/en/latest/manual/interacting-with-julia/#customizing-colors).
 
 Breaking changes