Update fontfaceobserver to the latest version 🚀

[greenkeeper[bot]]

The dependency fontfaceobserver was updated from 2.0.13 to 2.1.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Your Greenkeeper bot :palm_tree:

[codeclimate[bot]]

Code Climate has analyzed commit 956da293 and detected 0 issues on this pull request.

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[codecov[bot]]

Codecov Report

Merging #169 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   87.29%   87.29%           
=======================================
  Files          82       82           
  Lines         685      685           
=======================================
  Hits          598      598           
  Misses         87       87

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