Update README.md (#66)

Author: ghophp

README.md

@@ -60,7 +60,7 @@ comment. To make these files strict too, just remove its' ignore comments.
 
 ## Configuration
 
-Plugin takes extra, non-mandatory arguments `paths` and `exlude`. Both of them take an array of
+Plugin takes extra, non-mandatory arguments `paths` and `exclude`. Both of them take an array of
 relative or absolute paths that should be included (property `paths`) or excluded (property
 `exclude`). To add strict mode to files from ignored paths you can insert `//@ts-strict` comment.