Bump axios from 0.15.3 to 0.19.0 in /bilibili-api

Bumps [axios](https://github.com/axios/axios) from 0.15.3 to 0.19.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.15.3...v0.19.0)

Signed-off-by: dependabot[bot] <support@github.com>

bilibili-api/package.json

@@ -8,7 +8,7 @@
     "test": "cross-env NODE_ENV=test ./node_modules/.bin/nodemon ./index.js"
   },
   "dependencies": {
-    "axios": "^0.15.3",
+    "axios": "^0.19.0",
     "koa": "^2.0.0",
     "koa-bodyparser": "^3.2.0",
     "koa-convert": "^1.2.0",