fix(package): update strip-ansi to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "figures": "^2.0.0",
     "highlight-es": "^1.0.0",
     "lodash": "^4.15.0",
-    "strip-ansi": "^4.0.0"
+    "strip-ansi": "^5.0.0"
   },
   "devDependencies": {
     "chai": "^4.0.0",