Fix Travis so docs build and 1.4 is tested

[oxinabox]

Closes #64
which is actually already fixed by the docs were not deploying

[codecov]

Codecov Report

Merging #66 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   94.93%   94.90%   -0.04%     
==========================================
  Files           6        6              
  Lines         158      157       -1     
==========================================
- Hits          150      149       -1     
  Misses          8        8              

Impacted Files	Coverage Δ
src/file_io.jl	88.88% <0.00%> (-0.40%)	⬇️

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[rofinn]

Right, you can't use matrix and jobs concurrently. Has this been the configuration the entire time?

[oxinabox]

Right, you can't use matrix and jobs concurrently. Has this been the configuration the entire time?

Yes.
But it is only 6-12 months ago that TravisCI disallowed using both.
Broke every julia package using TravisCI for docs deplou,ent