修复文档对异步请求的错误示例

[Littleor]

文档中new了tokenFly而使用的却是newFly

[codecov-commenter]

Codecov Report

Merging #257 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #257   +/-   ##
=======================================
  Coverage   86.10%   86.10%           
=======================================
  Files           1        1           
  Lines         259      259           
=======================================
  Hits          223      223           
  Misses         36       36           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update fced928...45d26f2. Read the comment docs.