Small suggestions (add LinkedIn in contact methods)

Hi all
As possible, please add additional field in contact methods for LinkedIn

>> wordpress-seo\admin\class-admin.php

/**
	 * Filter the $contactmethods array and add Facebook, Google+, LinkedIn and Twitter.
	 *
	 * These are used with the Facebook author, rel="author" and Twitter cards implementation.
	 *
	 * @param array $contactmethods currently set contactmethods.
	 *
	 * @return array $contactmethods with added contactmethods.
	 */
	public function update_contactmethods( $contactmethods ) {
		// Add Google+
		$contactmethods['googleplus'] = __( 'Google+ full url like https://plus.google.com/+AhrefsCom/posts/?rel=author', 'wordpress-seo' );
		// Add Twitter
		$contactmethods['twitter'] = __( 'Twitter username (without @)', 'wordpress-seo' );
		// Add Facebook
		$contactmethods['facebook'] = __( 'Facebook profile URL (without https://facebook.com/)', 'wordpress-seo' );
		// Add LinkedIn
		$contactmethods['linkedin'] = __( 'LinkedIn (without https://linkedin.com/in/) or type whole url with http:// or https://', 'wordpress-seo' );

		return $contactmethods;
	}

thank you

https://wordpress.org/plugins/wordpress-seo/