Center logo in README

Author: ilyakooo0

README.md

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 # Knot
 
-<img src="logo.png" width="300px" align="center">
+<p align="center">
+  <img src="logo.png" width="300px" align="center">
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 Knot is a functional relational programming language. Relations are the primary data structure, computation is pure and functional, and state is automatically persisted to SQLite.