fix: deprecate the ! char as the escape char

This better aligns with what egineers are used to as the escape key.

Author: RonaldJerez

src/core.js

@@ -51,7 +51,7 @@ export function inputHandler(event) {
   event.stopPropagation()
 
   // gather some information from the input before masking
-  let cursorPosition = target.selectionEnd
+  const cursorPosition = target.selectionEnd
   const isCursorAtEnd = event.data && cursorPosition == target.value.length
   const digit = target.value[cursorPosition - 1] // last inserted digit
 

src/tokens.js

@@ -4,5 +4,6 @@ export default {
   S: { pattern: /[a-zA-Z]/ },
   A: { pattern: /[a-zA-Z]/, transform: (v) => v.toLocaleUpperCase() },
   a: { pattern: /[a-zA-Z]/, transform: (v) => v.toLocaleLowerCase() },
-  '!': { escape: true }
+  '!': { escape: true }, // deprecated, use \ moving forward
+  '\\': { escape: true }
 }