Bump Bootstrap to fix xss vulnerability

[landonreed]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Any modified or new methods or classes have helpful JSDoc and code is thoroughly commented
• The description lists all applicable issues this PR seeks to resolve
• The description lists any configuration setting(s) that differ from the default settings
• All tests and CI builds passing

Description

Bump Bootstrap to 3.4.1 to fix vulnerability identified by GitHub alert: https://blog.getbootstrap.com/2019/02/13/bootstrap-4-3-1-and-3-4-1/

[codecov-io]

Codecov Report

Merging #433 into dev will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             dev    #433   +/-   ##
=====================================
  Coverage    5.3%    5.3%           
=====================================
  Files        322     322           
  Lines      15468   15468           
  Branches    4674    4674           
=====================================
  Hits         820     820           
  Misses     12496   12496           
  Partials    2152    2152

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[landonreed]

🎉 This PR is included in version 4.1.0 🎉

The release is available on GitHub release

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