proposed get_css refactor

	/**
	 * Get the Font Awesome CSS.
	 *
	 * @since   1.0.0
	 *
	 * @param   string  $url       URL of the remote stylesheet.
	 * @param   string  $version   Version of Font Awesome to fetch.
	 *
	 * @return  string  $response  Font Awesome CSS, from either:
	 *                             1. transient,
	 *                             2. wp_remote_get(), or
	 *                             3. fallback CSS.
	 */
	private function get_css( $url, $version ) {

		// First try getting the transient CSS.
		$response = $this->get_transient_css( $version );

		/**
		 * Filter the force fallback flag.
		 *
		 * @since  1.0.4
		 *
		 * @param  bool  Whether or not to force the fallback CSS.
		 */
		$force_fallback = apply_filters( 'bfa_force_fallback', false );

		// Next, try fetching the CSS from the remote jsDelivr CDN.
		if ( ! $response && ! $force_fallback ) {
			$response = $this->get_remote_css( $url, $version );
		}

		/**
		 * Use the local fallback if both the transient and wp_remote_get()
		 * methods fail, or if fallback is forced with bfa_force_fallback filter.
		 */
		if ( $force_fallback || is_wp_error( $response ) ) {

			// Log the CSS fetch error.
			if ( ! $force_fallback ) {
				$this->set_error( 'css', $response->get_error_code(), $response->get_error_message() . " (URL: $url)" );
			}

			// Use the local fallback CSS.
			$response = $this->fallback_data['css'];

			// Update the version string to match the fallback version.
			$this->font_awesome_version = $this->fallback_data['version'];

			// Update the stylesheet URL to match the fallback version.
			$this->stylesheet_url = $this->fallback_data['url'];
		}

		return $response;

	}