Temporarily disable the requirement of a User-Agent header

cargo-vendor, which is used by Rust's CI, does not send a UA header, so
Rust's CI broke when we deployed this change. They're going to try and
fix that on their end in the next few days, but in the mean time we need
to disable this.

Author: sgrif

src/middleware/mod.rs

@@ -86,7 +86,10 @@ pub fn build_middleware(app: Arc<App>, endpoints: R404) -> MiddlewareBuilder {
         let ips = ip_list.split(',').map(String::from).collect();
         m.around(block_ips::BlockIps::new(ips));
     }
-    m.around(require_user_agent::RequireUserAgent::default());
+    // Note: Temporarily disabled because cargo-vendor doesn't include a
+    // User-Agent header and Rust's CI broke. If this is still commented out
+    // by Nov 7, 2018 we need to ping some folks
+    // m.around(require_user_agent::RequireUserAgent::default());
 
     if env != Env::Test {
         m.around(log_request::LogRequests::default());