Add iPhone XS Max frames

Author: jtholloran

Diff for: README.md

@@ -8,20 +8,20 @@
 
 #### How it Works
 
-Insert ten screenshots of your iPhone app into [Sketch](https://www.sketchapp.com/) symbols at both iPhone 6/7/8 and iPhone XS sizes.
+Insert ten screenshots of your iPhone app into [Sketch](https://www.sketchapp.com/) symbols at both iPhone 6/7/8 and iPhone XR, XS, and XS Max sizes.
 
-<img src="promo/instructions.jpg">
+<img src="promo/instructions.jpg" style="max-width:900px">
 
 Edit or add to ten additional symbols containing backgrounds and captions.
 
-<img src="promo/symbols.jpg">
+<img src="promo/symbols.jpg" style="max-width:700px">
 
 Choose from a variety of iPhone devices to frame your shots (now including "Clay" options).
 
 <img src="promo/choose_iphone_frame.gif">
 
-<img src="promo/preview.jpg">
+<img src="promo/preview.jpg" style="max-width:900px">
 
-Command + Shift + E: Sketch generates all the sizes required by the App Store for iPhone 4, SE, 6/7/8, 6/7/8 Plus, XS, and XR/XS Max.
+Command + Shift + E: Sketch generates all the sizes required by the App Store for iPhone 4, SE, 6/7/8, 6/7/8 Plus, XR, XS, and XS Max.
 
 Enjoy! :facepunch: