fixed readme.md wrong symbol

Signed-off-by: freezestart <freezestart@gmail.com>

readme.md

@@ -27,7 +27,7 @@ enjoy, not something that is painful. Enjoy the fresh air.
 
 Route::get('/', function()
 {
-	return "Hello World!":
+	return "Hello World!";
 });
 ```
 
@@ -64,4 +64,4 @@ git commit -s -m "this commit will be signed off automatically!"
 
 ## License
 
-Laravel is open-sourced software licensed under the MIT License.
+Laravel is open-sourced software licensed under the MIT License.