Update README.md

Author: nxrighthere

README.md

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 This is an improved version of [smmalloc](https://github.com/SergeyMakeev/smmalloc) a [fast and efficient](https://github.com/SergeyMakeev/smmalloc#features) memory allocator designed to handle many small allocations/deallocations in heavy multi-threaded scenarios. The allocator created for usage in applications where the performance is critical such as video games.