fix deprecation warning (close #427)

[helloyou2012]

No description provided.

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #429 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #429   +/-   ##
=======================================
  Coverage   90.25%   90.25%           
=======================================
  Files           6        6           
  Lines         359      359           
  Branches       75       76    +1     
=======================================
  Hits          324      324           
  Misses         35       35

Impacted Files	Coverage Δ
loader.js	90.47% <100%> (ø)	✅

---

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 a078c82...16e7601. Read the comment docs.

[scottdj92]

Looks good to me.

[michael-ciniawsky]

@d3viant0ne @bebraw Someone merge pleease :D