Update CI URLs to point to new caching infrastructure

[staticfloat]

Hello there!
This is an automated pull request submitted by @staticfloat to help package authors transition their Julia installation CI setups to the new binary provider URL. Please take a look at this PR, and if there is a problem or it doesn't download correctly when CI runs, feel free to ping @staticfloat

[codecov-io]

Codecov Report

Merging #34 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   85.09%   85.09%           
=======================================
  Files           4        4           
  Lines         208      208           
=======================================
  Hits          177      177           
  Misses         31       31

---

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 4992834...6f8f589. Read the comment docs.

[coveralls]

Coverage remained the same at 85.096% when pulling 6f8f589 on staticfloat:updated_ci_url into 4992834 on rveltz:master.

[coveralls]

Coverage remained the same at 85.096% when pulling 6f8f589 on staticfloat:updated_ci_url into 4992834 on rveltz:master.

[coveralls]

Coverage remained the same at 85.096% when pulling 6f8f589 on staticfloat:updated_ci_url into 4992834 on rveltz:master.

[ChrisRackauckas]

I updated this PR @rveltz and this will fix the AppVeyor problems.