Add option for generation of pywal colors with wallpaper change (#219)

* Add option for generation of pywal colors with wallpaper change

* Update README.md

* Address review

scss/options_trackers.ts

@@ -1,5 +1,5 @@
 import icons from "lib/icons";
-import { Notify, isAnImage } from "lib/utils";
+import { bash, dependencies, Notify, isAnImage } from "lib/utils";
 import options from "options";
 import Wallpaper from "services/Wallpaper";
 
@@ -50,6 +50,10 @@ export const initializeTrackers = (resetCssFunc: Function) => {
             options.resetTheme();
             resetCssFunc();
         }
+        if (options.wallpaper.pywal.value && dependencies('wal')) {
+            const wallpaperPath = options.wallpaper.image.value;
+            bash(`wal -i ${wallpaperPath}`);
+        }
     })
 
 }