pull requests of dependabot

[ValentinGratz]

Please consider the following before submitting a pull request:

Guidelines for contributing: https://github.com/pure-css/pure/blob/master/CONTRIBUTING.md

Example of changes on an interactive website such as the following:

• http://jsbin.com/
• http://jsfiddle.net/
• http://codepen.io/pen/

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I confirm that this contribution is made under a BSD license and that I have the authority necessary to make this contribution on behalf of its copyright owner.