<!-- Click "Preview" for a more readable version --

If you found an area that needs clarification, feel free to open a PR or list the section/content that could be improved below

Don't remove any title of the issue template, or it will be treated as invalid by the bot.

⚠️👆 Feel free to refer to these instructions before submitting the issue 👆⚠️
-->

#### Section/Content To Improve
https://github.com/axios/axios/blob/master/CHANGELOG.md

#### Suggested Improvement
Please add 0.21.1 to the Changelog.

#### Relevant File(s)
https://github.com/axios/axios/blob/master/CHANGELOG.md
dist/axios.js
var result = {};
	  function assignValue(val, key) {
	    if (isPlainObject(result[key]) && isPlainObject(val)) {
	      result[key] = merge(result[key], val);
	    } else if (isPlainObject(val)) {
	      result[key] = merge({}, val);
	    } else if (isArray(val)) {
	      result[key] = val.slice();
	    } else {
	      result[key] = val;
	    }
	  }
	
	  for (var i = 0, l = arguments.length; i < l; i++) {
	    forEach(arguments[i], assignValue);
	  }
	  return result;
	}
	
	/**
	 * Extends object a by mutably adding to it the properties of object b.
	 *
	 * @param {Object} a The object to be extended
	 * @param {Object} b The object to copy properties from
	 * @param {Object} thisArg The object to bind function to
	 * @return {Object} The resulting value of object a
	 */
	function extend(a, b, thisArg) {