Fix test coverage

Author: ehmicky

package.json

@@ -9,7 +9,7 @@
   ],
   "scripts": {
     "test": "gulp test",
-    "ci-test": "nyc npm test && coveralls <coverage/lcov.info",
+    "ci-test": "nyc --check-coverage --statements 100 --lines 100 --functions 100 --branches 100 npm test && coveralls <coverage/lcov.info",
     "prepublishOnly": "npm test",
     "release": "release-it"
   },

src/level.js

@@ -20,8 +20,10 @@ const getLevel = function({ opts, info }) {
   return defaultGetLevel(info)
 }
 
+// istanbul ignore next
 const supportsUnicode = platform !== 'win32' || TERM === 'xterm-256color'
 // Each level is printed in a different way
+// istanbul ignore next
 const LEVELS = {
   debug: {
     COLOR: 'blue',