style: use SVG instead in README.md

README.md

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-# <img height="40" style="image-rendering: pixelated; vertical-align: text-bottom; padding-right: 4px" src="assets/logo.png"> Cuckoo
+# <img height="30" src="assets/logo.svg"> Cuckoo
 
 A hash table that uses cuckoo hashing to achieve a worst-case O(1) lookup time.

assets/logo.svg

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