Update selenium-java to v3.13.0

[oshikiri]

It will resolve a circular dependency.

[warn] circular dependency found: org.seleniumhq.selenium#selenium-java;3.0.0-beta2->com.github.detro.ghostdriver#phantomjsdriver;1.1.0->org.seleniumhq.selenium#selenium-java;2.39.0
[warn] circular dependency found: org.seleniumhq.selenium#selenium-java;3.0.0-beta2->com.github.detro.ghostdriver#phantomjsdriver;1.1.0->org.seleniumhq.selenium#selenium-server;2.39.0->org.seleniumhq.selenium#selenium-java;2.39.0
[info] Done updating.
[info] Updating spark...
[info] Compiling 2 Scala sources to /home/travis/build/vegas-viz/Vegas/macros/target/scala-2.11/classes ...
[warn] circular dependency found: org.seleniumhq.selenium#selenium-java;3.0.0-beta2->com.github.detro.ghostdriver#phantomjsdriver;1.1.0->org.seleniumhq.selenium#selenium-java;2.39.0
[warn] circular dependency found: org.seleniumhq.selenium#selenium-java;3.0.0-beta2->com.github.detro.ghostdriver#phantomjsdriver;1.1.0->org.seleniumhq.selenium#selenium-server;2.39.0->org.seleniumhq.selenium#selenium-java;2.39.0

https://travis-ci.org/vegas-viz/Vegas/jobs/402833152#L815-L821

[codecov-io]

Codecov Report

Merging #151 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #151   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          27     27           
  Lines        1906   1906           
  Branches        5      5           
=====================================
  Misses       1906   1906

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[oshikiri]

@aishfenton @dbtsai @rgbkrk Could you please review this? :bowing_man: