title: Why Swashbuckle.aspnet.core.swagger not being recognized
body: <p>I've installed though <code>nuget package manager</code> the <code>Swashbuckle.AspNetCore.Swagger</code> and had included the using <code>Swashbuckle.AspNetCore.Swagger</code> on the top, but I get error on the <code>Info{ Title}</code> methods. 
  Can anyone please suggest how to solve this issue.</p>
  
  <pre><code> services.AddSwaggerGen(c =&gt;
              {
                  c.SwaggerDoc("v1", new Info { Title = "My DAB API", Version = "V3.2.2" });
              }); 
  </code></pre>