add link to wiki on --compilers deprecation

bin/_mocha

@@ -347,14 +347,8 @@ if (program.forbidPending) mocha.forbidPending();
 // custom compiler support
 
 if (program.compilers.length > 0) {
-  require("util").deprecate(function () {}, [
-    "`--compilers` is likely to be replaced in a future version of Mocha.",
-    "Instead use `--require` to load the compiler and add your file extension(s) to your filepath globs.",
-    "To glob for multiple file extensions, \"quote\" the path and use `@(one|the-other)`, e.g. \"test/**/*.spec.@(js|coffee)\""
-  ]
-    .concat(program.watch ? ["With `--watch`, also add the extensions through `--watch-extensions`"] : [])
-    .join("\n")
-  )()
+  require('util').deprecate(function () {},
+    '"--compilers" will be removed in a future version of Mocha; see https://git.io/vdGQW for more info')();
 }
 var extensions = ['js'];
 program.compilers.forEach(function (c) {