Update README.md (#534)

irreplacable -> irreplaceable

README.md

@@ -58,7 +58,7 @@ options:
 Looking for a CLI mode? Using the -f/--face argument will make the program in cli mode.
 
 ## Credits
-- [henryruhs](https://github.com/henryruhs): for being an irreplacable contributor to the project
+- [henryruhs](https://github.com/henryruhs): for being an irreplaceable contributor to the project
 - [ffmpeg](https://ffmpeg.org/): for making video related operations easy
 - [deepinsight](https://github.com/deepinsight): for their [insightface](https://github.com/deepinsight/insightface) project which provided a well-made library and models.
 - and all developers behind libraries used in this project.