Update to official Mastercard icon

CHECK.html

@@ -229,7 +229,7 @@ <h1>
 <tr><td>Malt</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/malt.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/malt.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/malt.svg" width="100"></td></tr>
 <tr><td>Manjaro</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/manjaro.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/manjaro.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/manjaro.svg" width="100"></td><td><a href="https://manjaro.org/img/logo.svg">https://manjaro.org/img/logo.svg</a></td></tr>
 <tr><td>Markdown</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/markdown.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/markdown.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/markdown.png" width="100"></td><td><a href="https://www.markdownguide.org/">https://www.markdownguide.org/</a></td></tr>
-<tr><td>mastercard</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/mastercard.png" width="100"></td><td><a href="https://www.mastercard.com/global/en.html">https://www.mastercard.com/global/en.html</a></td></tr>
+<tr><td>mastercard</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/mastercard.svg" width="100"></td><td><a href="https://www.mastercard.com/global/en.html">https://www.mastercard.com/global/en.html</a></td></tr>
 <tr><td>Mastodon</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastodon.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mastodon.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/mastodon.svg" width="100"></td><td><a href="https://github.com/tootsuite/joinmastodon/blob/master/public/press-kit.zip">https://github.com/tootsuite/joinmastodon/blob/master/public/press-kit.zip</a></td></tr>
 <tr><td>matrix</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/matrix.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/matrix.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/matrix.svg" width="100"></td></tr>
 <tr><td>Mattermost</td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mattermost.svg" width="100" /></td><td><img src="https://edent.github.io/SuperTinyIcons/images/svg/mattermost.svg" width="100" style="border-radius: 50%;"></td><td><img src="https://edent.github.io/SuperTinyIcons/images/reference/mattermost.png" width="100"></td><td><a href="https://www.mattermost.org/brand-guidelines/">https://www.mattermost.org/brand-guidelines/</a></td></tr>

REFERENCE.md

@@ -211,7 +211,7 @@ Mailchimp | <img src="https://edent.github.io/SuperTinyIcons/images/svg/mailchim
 Malt | <img src="https://edent.github.io/SuperTinyIcons/images/svg/malt.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/malt.svg" width="256"> | 
 Manjaro | <img src="https://edent.github.io/SuperTinyIcons/images/svg/manjaro.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/manjaro.svg" width="256"> | https://manjaro.org/img/logo.svg
 Markdown | <img src="https://edent.github.io/SuperTinyIcons/images/svg/markdown.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/markdown.png" width="256"> | https://www.markdownguide.org/
-mastercard | <img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/mastercard.png" width="256"> | https://www.mastercard.com/global/en.html
+mastercard | <img src="https://edent.github.io/SuperTinyIcons/images/svg/mastercard.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/mastercard.svg" width="256"> | https://www.mastercard.com/global/en.html
 Mastodon | <img src="https://edent.github.io/SuperTinyIcons/images/svg/mastodon.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/mastodon.svg" width="256"> | https://github.com/tootsuite/joinmastodon/blob/master/public/press-kit.zip
 matrix | <img src="https://edent.github.io/SuperTinyIcons/images/svg/matrix.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/matrix.svg" width="256"> | 
 Mattermost | <img src="https://edent.github.io/SuperTinyIcons/images/svg/mattermost.svg" width="256" /> | <img src="https://edent.github.io/SuperTinyIcons/images/reference/mattermost.png" width="256"> | https://www.mattermost.org/brand-guidelines/