Update lint to same standard as metamask-extension

Author: darkwing

.eslintrc.js

@@ -33,4 +33,4 @@ module.exports = {
   }],
 
   ignorePatterns: ['dist'],
-}
+};

.prettierrc.yml

@@ -0,0 +1,2 @@
+singleQuote: true
+trailingComma: all