Updated README

Author: squidfunk

README.md

@@ -127,11 +127,14 @@ For other installation methods, configuration options, and a demo, visit
 ## Premium Sponsors
 
 <p>
+  <a href="https://hummingbot.io/" target=_blank><img
+    src="https://raw.githubusercontent.com/squidfunk/mkdocs-material/master/.github/assets/sponsors/hummingbot.png" height="50"
+  /></a>
   <a href="https://docs.baslerweb.com/" target=_blank><img
-    src="https://raw.githubusercontent.com/squidfunk/mkdocs-material/master/.github/assets/sponsors/basler.png" width="155"
+    src="https://raw.githubusercontent.com/squidfunk/mkdocs-material/master/.github/assets/sponsors/basler.png" height="50"
   /></a>
   <a href="https://cirrus-ci.org/" target=_blank><img
-    src="https://raw.githubusercontent.com/squidfunk/mkdocs-material/master/.github/assets/sponsors/cirrus-ci.svg" width="155"
+    src="https://raw.githubusercontent.com/squidfunk/mkdocs-material/master/.github/assets/sponsors/cirrus-ci.svg" height="50"
   /></a>
 </p>