fix(package): update feather-icons to version 4.2.0

Closes #23

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "bootstrap-sass": "^3.3.7",
     "classlist.js": "^1.1.20150312",
     "core-js": "^2.4.1",
-    "feather-icons": "^3.0.0",
+    "feather-icons": "^4.2.0",
     "i": "^0.3.5",
     "ng2-markdown-to-html": "^1.3.0",
     "npm": "^5.3.0",