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

[coveralls]

Coverage remained the same at 64.057% when pulling 56d8986 on staticfloat:updated_ci_url into a42a15a on jtramm:master.

[coveralls]

Coverage remained the same at 64.057% when pulling 56d8986 on staticfloat:updated_ci_url into a42a15a on jtramm:master.

[codecov-io]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   64.05%   64.05%           
=======================================
  Files           1        1           
  Lines         281      281           
=======================================
  Hits          180      180           
  Misses        101      101

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