Fix generated example invocations - they compile now.

src/generator/templates/api/lib/lib.mako

@@ -261,7 +261,7 @@ let auth = oauth2::InstalledFlowAuthenticator::builder(
         secret,
         oauth2::InstalledFlowReturnMethod::HTTPRedirect,
     ).build().await.unwrap();
-let mut hub = ${hub_type}::new(hyper::Client::builder().build(hyper_rustls::HttpsConnectorBuilder::new().with_native_roots().https_or_http().enable_http1().enable_http2().build()), auth);\
+let mut hub = ${hub_type}::new(hyper::Client::builder().build(hyper_rustls::HttpsConnectorBuilder::new().with_native_roots().https_or_http().enable_http1().build()), auth);\
 </%def>
 
 ## You will still have to set the filter for your comment type - either nothing, or rust_doc_comment !

src/generator/templates/cli/main.rs.mako

@@ -38,7 +38,6 @@ async fn main() {
     let connector = hyper_rustls::HttpsConnectorBuilder::new().with_native_roots()
         .https_or_http()
         .enable_http1()
-        .enable_http2()
         .build();
 
     match Engine::new(matches, connector).await {