use master branch of deps in nightly test stage

[johnnychen94]

CI updating work: #805

To make it work, you need:

• set Travis environment variable in https://travis-ci.org/JuliaImages/Images.jl/settings

SCRIPT_URL=https://gist.githubusercontent.com/johnnychen94/720900fd9e44395beaa0704770c91a36/raw/74f1a02f420a3ccd64b56cfc14111d170f559330/checkout_master.jl

• retrigger the ci

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Other related question:

can we set a daily/weekly Travis cron work on Images.jl#master? Or perhaps more aggressively disable allow_failures on nightly?

By doing this, whenever we want to tag a new release in submodules, we can check if Images.jl passes the nightly test stage, and fixes potential bugs if there are.

[codecov]

Codecov Report

Merging #806 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #806   +/-   ##
=======================================
  Coverage   58.98%   58.98%           
=======================================
  Files          10       10           
  Lines        1236     1236           
=======================================
  Hits          729      729           
  Misses        507      507

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[johnnychen94]

Close this issue according to discussion in #805