Follow Rust and crates update

plume-models/src/lib.rs

@@ -1,4 +1,3 @@
-#![feature(try_trait)]
 #![feature(never_type)]
 #![feature(proc_macro_hygiene)]
 #![feature(box_patterns)]
@@ -86,12 +85,6 @@ impl From<diesel::result::Error> for Error {
     }
 }
 
-impl From<std::option::NoneError> for Error {
-    fn from(_: std::option::NoneError) -> Self {
-        Error::NotFound
-    }
-}
-
 impl From<url::ParseError> for Error {
     fn from(_: url::ParseError) -> Self {
         Error::Url