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

@@           Coverage Diff           @@
##           master       #1   +/-   ##
=======================================
  Coverage   82.14%   82.14%           
=======================================
  Files           3        3           
  Lines          56       56           
=======================================
  Hits           46       46           
  Misses         10       10

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[coveralls]

Coverage remained the same at 82.143% when pulling 5593962 on staticfloat:ci_url into 5150cb6 on alecloudenback:master.