fix(package): update ansi_up to version 4.0.4

Closes #134

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "webpack": "^3.0.0"
   },
   "dependencies": {
-    "ansi_up": "^2.0.2",
+    "ansi_up": "^4.0.4",
     "codemirror": "^5.27.2",
     "knockout": "^3.4.2",
     "linkifyjs": "^2.1.4"