update bootstrap to version 4.3.1

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diff --git a/vendor/twbs/bootstrap/site/docs/4.3/components/jumbotron.md b/vendor/twbs/bootstrap/site/docs/4.3/components/jumbotron.md
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+---
+layout: docs
+title: Jumbotron
+description: Lightweight, flexible component for showcasing hero unit style content.
+group: components
+---
+
+A lightweight, flexible component that can optionally extend the entire viewport to showcase key marketing messages on your site.
+
+{% capture example %}
+<div class="jumbotron">
+  <h1 class="display-4">Hello, world!</h1>
+  <p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>
+  <hr class="my-4">
+  <p>It uses utility classes for typography and spacing to space content out within the larger container.</p>
+  <a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>
+</div>
+{% endcapture %}
+{% include example.html content=example %}
+
+To make the jumbotron full width, and without rounded corners, add the `.jumbotron-fluid` modifier class and add a `.container` or `.container-fluid` within.
+
+{% capture example %}
+<div class="jumbotron jumbotron-fluid">
+  <div class="container">
+    <h1 class="display-4">Fluid jumbotron</h1>
+    <p class="lead">This is a modified jumbotron that occupies the entire horizontal space of its parent.</p>
+  </div>
+</div>
+{% endcapture %}
+{% include example.html content=example %}