Update app name

Author: GitauHarrison

app/templates/base.html

@@ -24,7 +24,7 @@
                     <span class="icon-bar"></span>
                     <span class="icon-bar"></span>
                 </button>
-                <a class="navbar-brand" href="{{ url_for('index') }}">Flask Auth</a>
+                <a class="navbar-brand" href="{{ url_for('index') }}">Flask OAuth</a>
             </div>
             <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                 <ul class="nav navbar-nav">