Fix ancient Babel

Closes GH-4.

Author: wooorm

index.js

@@ -396,9 +396,9 @@ function collectText(node, options) {
     //     break is the zero-width space character (U+200B), then the break is
     //     removed, leaving behind the zero-width space.
     if (
-      lines[index].charCodeAt(lines[index].length - 1) === 0x20_0b /* ZWSP */ ||
+      lines[index].charCodeAt(lines[index].length - 1) === 0x200b /* ZWSP */ ||
       (index < lines.length - 1 &&
-        lines[index + 1].charCodeAt(0) === 0x20_0b) /* ZWSP */
+        lines[index + 1].charCodeAt(0) === 0x200b) /* ZWSP */
     ) {
       result.push(lines[index])
       join = ''

package.json

@@ -69,7 +69,10 @@
     "trailingComma": "none"
   },
   "xo": {
-    "prettier": true
+    "prettier": true,
+    "rules": {
+      "unicorn/numeric-separators-style": "off"
+    }
   },
   "remarkConfig": {
     "plugins": [