Fixing TypeScript usage. Fixes #60 (#67)

* Fixing TypeScript usage

* Removing extraneous formatting

Author: davidkpiano

README.md

@@ -57,7 +57,7 @@ You can find the library on `window.mitt`.
 ```js
 import mitt from 'mitt'
 
-let emitter = mitt()
+const emitter = mitt()
 
 // listen to an event
 emitter.on('foo', e => console.log('foo', e) )
@@ -77,8 +77,8 @@ emitter.off('foo', onFoo)  // unlisten
 ### Typescript
 
 ```ts
-import * as mitt from 'mitt';
-let emitter: mitt.Emitter = new mitt();
+import mitt from 'mitt';
+const emitter: mitt.Emitter = mitt();
 ```
 
 ## Examples & Demos

mitt.d.ts

@@ -8,37 +8,37 @@ declare namespace mitt {
 	type Handler = (event?: any) => void;
 
 	interface MittStatic {
-		new(all?: {[key: string]: Handler}): Emitter;
+		(all?: {[key: string]: Handler}): Emitter;
 	}
 
 	interface Emitter {
 		/**
 		 * Register an event handler for the given type.
-		 * 
+		 *
 		 * @param {string} type Type of event to listen for, or `"*"` for all events.
 		 * @param {Handler} handler Function to call in response to the given event.
-		 * 
+		 *
 		 * @memberOf Mitt
 		 */
 		on(type: string, handler: Handler): void;
 
 		/**
 		 * Function to call in response to the given event
-		 * 
+		 *
 		 * @param {string} type Type of event to unregister `handler` from, or `"*"`
 		 * @param {Handler} handler Handler function to remove.
-		 * 
+		 *
 		 * @memberOf Mitt
 		 */
 		off(type: string, handler: Handler): void;
 
 		/**
 		 * Invoke all handlers for the given type.
 		 * If present, `"*"` handlers are invoked prior to type-matched handlers.
-		 * 
+		 *
 		 * @param {string} type The event type to invoke
 		 * @param {any} [event] An event object, passed to each handler
-		 * 
+		 *
 		 * @memberOf Mitt
 		 */
 		emit(type: string, event?: any): void;