update bootstrap to version 4.3.1

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diff --git a/vendor/twbs/bootstrap/site/docs/4.3/about/license.md b/vendor/twbs/bootstrap/site/docs/4.3/about/license.md
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+---
+layout: docs
+title: License FAQs
+description: Commonly asked questions about Bootstrap's open source license.
+group: about
+---
+
+Bootstrap is released under the MIT license and is copyright {{ site.time | date: "%Y" }} Twitter. Boiled down to smaller chunks, it can be described with the following conditions.
+
+#### It requires you to:
+
+* Keep the license and copyright notice included in Bootstrap's CSS and JavaScript files when you use them in your works
+
+#### It permits you to:
+
+- Freely download and use Bootstrap, in whole or in part, for personal, private, company internal, or commercial purposes
+- Use Bootstrap in packages or distributions that you create
+- Modify the source code
+- Grant a sublicense to modify and distribute Bootstrap to third parties not included in the license
+
+#### It forbids you to:
+
+- Hold the authors and license owners liable for damages as Bootstrap is provided without warranty
+- Hold the creators or copyright holders of Bootstrap liable
+- Redistribute any piece of Bootstrap without proper attribution
+- Use any marks owned by Twitter in any way that might state or imply that Twitter endorses your distribution
+- Use any marks owned by Twitter in any way that might state or imply that you created the Twitter software in question
+
+#### It does not require you to:
+
+- Include the source of Bootstrap itself, or of any modifications you may have made to it, in any redistribution you may assemble that includes it
+- Submit changes that you make to Bootstrap back to the Bootstrap project (though such feedback is encouraged)
+
+The full Bootstrap license is located [in the project repository]({{ site.repo }}/blob/v{{ site.current_version }}/LICENSE) for more information.