Fix task number

Author: cuklev

Practical Exams/16-August-2016/task-2/README.md

@@ -1,4 +1,4 @@
-# Task ?: File explorer
+# Task 2 - File explorer
 
 ## Description
 
@@ -33,4 +33,4 @@ The file explorer should look like that:
     ```js
         { name: String, files: [ fileObjects ] }
     ```
-    - Take a peek at the input parameter in `index.html`.
+    - Take a peek at the input parameter in `index.html`.