Update index.js

Co-authored-by: Jordan Harband <ljharb@gmail.com>

index.js

@@ -2,7 +2,7 @@
 const internalRe = require('./internal/re')
 const constants = require('./internal/constants')
 const SemVer = require('./classes/semver')
-const indentifiers = require('./internal/identifiers')
+const identifiers = require('./internal/identifiers')
 const parse = require('./functions/parse')
 const valid = require('./functions/valid')
 const clean = require('./functions/clean')