Drops the es2020 definition of UnicodeBCP47LocaleIdentifier, it's now available in es2016

Author: orta

src/lib/es2020.intl.d.ts

@@ -1,13 +1,5 @@
 declare namespace Intl {
 
-    /**
-     * [Unicode BCP 47 Locale Identifiers](https://unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers) definition.
-     *
-     * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#locales_argument).
-     *
-     */
-    type UnicodeBCP47LocaleIdentifier = string;
-
     /**
      * Unit to use in the relative time internationalized message.
      *