Fix ratelimit

[Khaledgarbaya]

With the new Axios beta the defaults config are no longer carried to the instance.
This behaviour is breaking the ratelimit logic

[codecov]

Codecov Report

Merging #65 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   69.48%   69.65%   +0.16%     
==========================================
  Files           6        6              
  Lines         921      926       +5     
  Branches      163      164       +1     
==========================================
+ Hits          640      645       +5     
  Misses        281      281

Impacted Files	Coverage Δ
lib/rate-limit.js	76.11% <100%> (+0.6%)	⬆️
lib/create-http-client.js	71.75% <100%> (ø)	⬆️

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[Khaledgarbaya]

FYI, I made a PR to axios to allow for a custom config so so might not need this PR.

[phoebeschmidt]

Should this be merged into @next instead of master? since it's relying on axios beta?

otherwise 👍