Wording to macOS and proper noun capitalization

README.md

@@ -3,7 +3,7 @@ Run spell check on all text layers in the page.
 
 Displays a basic panel that allows users to replace the misspelled word or add it to the dictionary, or ignore it.
 
-Uses OSX's built-in spelling features and dictionary to do this.
+Uses macOS's built-in spelling features and dictionary to do this.
 
 ## Change Log
 
@@ -16,10 +16,10 @@ Uses OSX's built-in spelling features and dictionary to do this.
 ### 0.5 Detects and lists misspellings
 
 ## The problem
-Spell check isn't available for all text layers at a time. If you're using sketch as a replacement for illustrator or inDesign, you really miss the ability to automatically spell check everything everywhere.
+Spell check isn't available for all text layers at a time. If you're using Sketch as a replacement for Illustrator or InDesign, you really miss the ability to automatically spell check everything everywhere.
 
 ## Usage
-**To install it, simply [download the zip](https://github.com/tallwave/sketch-spellcheck-all-layers/archive/master.zip) and double-click the “.sketchplugin” file.** You can access the plugin via the plugins menu. You’ll know its worked when you see the notification at the bottom of the screen.
+**To install it, simply [download the zip](https://github.com/tallwave/sketch-spellcheck-all-layers/archive/master.zip) and double-click the “.sketchplugin” file.** You can access the plugin via the Plugins menu. You’ll know it's worked when you see the notification at the bottom of the screen.
 
 Here’s a screen capture of the plugin in action: