I took out the cache break code at the end of the stylesheet call.
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title><?php wp_title(); ?></title>
<!-- <link rel="shortcut icon" href="<?php echo get_template_directory_uri(); ?>/favicon.ico"> -->
- <link rel="stylesheet" href="<?php echo get_stylesheet_directory_uri() ; ?>/css/app.css?v=1.0">
+ <link rel="stylesheet" href="<?php echo get_stylesheet_directory_uri() ; ?>/css/app.css">
<link href='https://fonts.googleapis.com/css?family=Josefin+Sans:400,600,700' rel='stylesheet' type='text/css'>
<?php wp_head(); ?>
</head>