fix(cli): fixed wrong url on help text

fix #11

cli.js

@@ -7,6 +7,8 @@ const preLogger = require('./helpers/logger');
 
 const cli = meow(
   `
+$ pwa-asset-generator --help
+
   Usage
     $ pwa-asset-generator [source] [output-folder]
     
@@ -30,7 +32,7 @@ const cli = meow(
     $ pwa-asset-generator logo.html .
     $ pwa-asset-generator https://your-cdn-server.com/assets/logo.png . -t jpeg -q 90 --splash-only --portrait-only
     $ pwa-asset-generator logo.svg ./assets --scrape false --icon-only
-    $ pwa-asset-generator https://cdn.freebiesupply.com/logos/large/2x/amazon-icon-logo-png-transparent.png -p "15%" -b "linear-gradient(to top, #fad0c4 0%, #ffd1ff 100%)"
+    $ pwa-asset-generator https://raw.githubusercontent.com/onderceylan/pwa-asset-generator/HEAD/static/logo.png -p "15%" -b "linear-gradient(to right, #fa709a 0%, #fee140 100%)"
 
   Flag examples
     --background="rgba(255, 255, 255, .5)"