⬆️ Upgraded enzyme to v3 (fixes #198)

[pcgilday]

• Use chai-enzyme@1.0.0-beta.0
• Added enzyme-adapter-react-15
• Added react-test-renderer b/c enyzme-adapter-react-15 peer dependency

closes #198

[HomeZenBot]

This change is 

[codecov]

Codecov Report

Merging #211 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #211   +/-   ##
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  Coverage     100%   100%           
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  Files           6      6           
  Lines          34     35    +1     
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+ Hits           34     35    +1

[pcgilday]

Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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a discussion (no related file):
This gets the current tests passing, but is using chai-enzyme@1.0.0-beta.0. I'm not sure if it would be better to wait for chai-enzyme v1 to come out of beta or move forward with the beta version?

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Comments from Reviewable

[SpainTrain]

Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, 3 unresolved discussions.

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package.json, line 53 at r1 (raw file):

    "cross-env": "~5.0.0",
    "enzyme": "~3.1.0",
    "enzyme-adapter-react-15": "^1.0.1",

tilde!

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package.json, line 73 at r1 (raw file):

    "react-addons-test-utils": "~15.6.0",
    "react-dom": "~15.6.1",
    "react-test-renderer": "^15.6.2",

tilde!

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Comments from Reviewable