Adjust Type Definition

Fix several problems with the type definition:

1. Initializing a `const` in a type declaration is not allowed and
results in the error "A 'const' initializer in an ambient context must
be a string or numeric literal or literal enum reference.ts(1254)".
2. The returned reducer had no strongly typed dispatch, losing
type-safety.
3. The returned reducer did not accept dispatch without any action,
which is a supported use case.

Author: ahilke

index.d.ts

@@ -1,5 +1,5 @@
 declare module "use-reducer-logger" {
     type Reducer<State = any, Action = any> = (state: State, action: Action) => State;
-    const logger = <State>(reducer: Reducer<State, Action>): Reducer<State, Action> => Reducer;
-    export default logger
+    const logger: <R extends Reducer>(reducer: R) => R;
+    export default logger;
 }