chore(package): update bili to version 4.8.1

Closes #15

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "through2": "^3.0.0"
   },
   "devDependencies": {
-    "bili": "^3.4.2",
+    "bili": "^4.8.1",
     "chai": "^4.1.2",
     "mocha": "^6.0.0",
     "vinyl": "^2.1.0"