Fix pixelated application icons for Windows

Added 20x20, 24x24 and 40x40 icons to icon.ico

Top left of the window: #98
Taskbar icon: #192

CHANGELOG.md

@@ -33,6 +33,9 @@ Release date: TBD
 ### Bug Fixes
 - Fixed an issue where the maximized state of the app window was lost in some cases.
 
+#### Windows
+- Fixed pixelated application icons in top left of the window.
+
 
 ## Release v1.3.0
 

src/main.js

@@ -349,9 +349,7 @@ app.on('ready', function() {
     // follow Electron's defaults
     window_options = {};
   }
-  if (process.platform === 'win32' || process.platform === 'linux') {
-    // On HiDPI(125%) Windows environment, the taskbar icon is pixelated. So this line is necessary. See #192.
-    // As the side effect, #98 reoccurs.
+  if (process.platform === 'linux') {
     window_options.icon = path.resolve(__dirname, 'resources/appicon.png');
   }
   window_options.title = app.getName();