bootstrap nav walker header

gistfile1.txt

<header id="masthead" class="site-header navbar" role="banner" itemscope="itemscope" itemtype="http://schema.org/WPHeader">
	<div class="container">
		<div class="row">
			<div class="navbar-header">
	    	  		<a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home" class="navbar-brand"><?php bloginfo( 'name' ); ?></a>
	    		</div>

			<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
				<?php /* Primary navigation */
					wp_nav_menu( array(
			  			'theme_location' => 'primary',
			  			'depth' => 2,
			  			'container' => false,
			  			'menu_class' => 'nav navbar-nav',
			  			//Process nav menu using our custom nav walker
			  			'walker' => new wp_bootstrap_navwalker())
					);
				?>
			</div>
		</div><!-- .row -->
	</div><!-- .container -->
</header><!-- .site-header -->