renamed binary file of Grader App v1.1.0 for Windows OS and updated file names in ReadMe

Author: kalindkaria

README.md

@@ -26,9 +26,9 @@ Following are the contents:
 
 - **practice_task_grader_app** - This folder consists the binary files of ***Practice Task*** Grader App for **Linux**, **Windows** and **Macintosh** OS.
   - Latest version is **[v1.1.0](https://github.com/eyantra/nb-theme-grader-app/releases/latest)**
-    - **`NB_Practice_Task_GUI-1.1.0.AppImage`**
-    - **`NB_Practice_Task_GUI_Setup-1.1.0.exe`**
-    - **`NB_Practice_Task_GUI-1.1.0.dmg`**
+    - **`NB_Practice_Task_GUI-1.1.0_linux.AppImage`**
+    - **`NB_Practice_Task_GUI-1.1.0_win.exe`**
+    - **`NB_Practice_Task_GUI-1.1.0_mac.dmg`**
 
 - **task_5_grader_app** - This folder consists the binary files of ***Task 5*** Grader App for **Linux**, **Windows** and **Macintosh** OS.
   - Latest version is **[v1.0.1](https://github.com/eyantra/nb-theme-grader-app/releases/tag/v1.0.1)**