Update docs and coverage version to Julia 1.3

[abelsiqueira]

No description provided.

[coveralls]

Coverage remained the same at 96.308% when pulling 3fa55d4 on abelsiqueira:docs-and-coverage-versions-to-1.3 into 644cd34 on JuliaSmoothOptimizers:master.

[codecov]

Codecov Report

Merging #131 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #131   +/-   ##
======================================
  Coverage    96.3%   96.3%           
======================================
  Files           8       8           
  Lines         623     623           
======================================
  Hits          600     600           
  Misses         23      23

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