[Snyk] Upgrade semver from 5.5.0 to 6.3.0

[snyk-bot]

Snyk has created this PR to upgrade semver from 5.5.0 to 6.3.0.

Warning: This is a major version upgrade, and may be a breaking change.

• The recommended version is 10 versions ahead of your current version.
• The recommended version was released 3 months ago, on 2019-07-23.

Release notes

• Package name: semver
  • 6.3.0 - 2019-07-23

    6.3.0

  • 6.2.0 - 2019-07-01

    6.2.0

  • 6.1.3 - 2019-07-01

    6.1.3

  • 6.1.2 - 2019-06-24

    6.1.2

  • 6.1.1 - 2019-05-28

    6.1.1

  • 6.1.0 - 2019-05-22

    6.1.0

  • 6.0.0 - 2019-03-26

    6.0.0

  • 5.7.1 - 2019-08-12

      </li>
      <li>
        <b>5.7.0</b> - <a href="https://github.com/npm/node-semver/releases/tag/v5.7.0">2019-03-26</a>
        <p>5.7.0</p>
      </li>
      <li>
        <b>5.6.0</b> - <a href="https://github.com/npm/node-semver/releases/tag/v5.6.0">2018-10-10</a>
        <p>5.6.0</p>
      </li>
      <li>
        <b>5.5.1</b> - <a href="https://github.com/npm/node-semver/releases/tag/v5.5.1">2018-08-17</a>
        <p>5.5.1</p>
      </li>
      <li>
        <b>5.5.0</b> - <a href="">2018-01-16</a>
        
      </li>
    </ul>
    

  from [`semver` GitHub Release Notes](https://github.com/npm/node-semver/releases)

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