fix a misprint

Co-authored-by: drons <[email protected]>

Author: yurymalkov

README.md

@@ -7,7 +7,7 @@ Header-only C++ HNSW implementation with python bindings, insertions and updates
 
 * Added support to filtering (#402, #430) by [@kishorenc](https://github.com/kishorenc)
 * Added python interface for filtering (though note its performance is limited by GIL) (#417) by [@gtsoukas](https://github.com/gtsoukas)
-* Added support for replacing the elements that were market as delete with newly inserted elements (to control the size of the index, #418) by [@dyashuni](https://github.com/dyashuni)
+* Added support for replacing the elements that were marked as delete with newly inserted elements (to control the size of the index, #418) by [@dyashuni](https://github.com/dyashuni)
 * Fixed data races/deadlocks in updates/insertion, added stress test for multithreaded operation (#418) by [@dyashuni](https://github.com/dyashuni)
 * Documentation, tests, exception handling, refactoring (#375, #379, #380, #395, #396, #401, #406, #404, #409, #410, #416, #415, #431, #432, #433) by [@jlmelville](https://github.com/jlmelville), [@dyashuni](https://github.com/dyashuni), [@kishorenc](https://github.com/kishorenc), [@korzhenevski](https://github.com/korzhenevski), [@yoshoku](https://github.com/yoshoku), [@jianshu93](https://github.com/jianshu93), [@PLNech](https://github.com/PLNech)
 * global linkages (#383) by [@MasterAler](https://github.com/MasterAler), USE_SSE usage in MSVC (#408) by [@alxvth](https://github.com/alxvth)