Remove supports-color dependency as it's available in chalk

lib/babel/helpers/code-frame.js

@@ -1,6 +1,5 @@
 // syntax highlighting based on https://github.com/dominictarr/ansi-highlight by the fantastic Dominic Tarr
 
-var supportsColor = require("supports-color");
 var tokenize      = require("js-tokenizer");
 var chalk         = require("chalk");
 var util          = require("../util");
@@ -43,7 +42,7 @@ var highlight = function (text) {
 module.exports = function (lines, lineNumber, colNumber) {
   colNumber = Math.max(colNumber, 0);
 
-  if (supportsColor) {
+  if (chalk.supportsColor) {
     lines = highlight(lines);
   }
 

package.json

@@ -59,7 +59,6 @@
     "roadrunner": "1.0.4",
     "source-map": "0.1.43",
     "source-map-support": "0.2.9",
-    "supports-color": "1.2.0",
     "useragent": "^2.1.5"
   },
   "devDependencies": {