Update README.md

Author: rwieruch

README.md

@@ -12,7 +12,7 @@ Custom hook to combine all useReducer hooks for one global state container with
 
 `npm install use-combined-reducers`
 
-Optional TS support: `npm install @types/use-combined-reducers —save-dev`
+Optional TS support: `npm install @types/use-combined-reducers --save-dev`
 
 ## Usage