housekeeping: fix logo size (#5702)

README.md

@@ -1,4 +1,4 @@
-# <img src="https://raw.githubusercontent.com/swagger-api/swagger.io/wordpress/images/assets/SWU-logo-clr.png" height="80">
+# <img src="https://raw.githubusercontent.com/swagger-api/swagger.io/wordpress/images/assets/SWU-logo-clr.png" width="300">
 
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