Add Error(Hyper) for errors originated from Hyper

During the parsing of the HTTP responses an error might come from
*Hyper*. To pass this error down to the caller, we need an entry in
`Error`.

Cargo.toml

@@ -13,6 +13,7 @@ version = "0.5.0"
 [dependencies]
 futures = "0.1.15"
 http = "0.1.0"
+hyper = "0.12"
 serde_json = "1.0.3"
 serde_urlencoded = "0.5.1"
 

src/lib.rs

@@ -14,6 +14,7 @@
 
 extern crate futures;
 extern crate http;
+extern crate hyper;
 #[cfg(test)]
 extern crate ruma_identifiers;
 #[cfg(test)]
@@ -45,6 +46,8 @@ pub trait Endpoint<T, U> {
 pub enum Error {
     /// An HTTP error.
     Http(http::Error),
+    /// An Hyper error.
+    Hyper(hyper::Error),
     /// A I/O error.
     Io(io::Error),
     /// A Serde JSON error.
@@ -65,6 +68,12 @@ impl From<http::Error> for Error {
     }
 }
 
+impl From<hyper::Error> for Error {
+    fn from(error: hyper::Error) -> Self {
+        Error::Hyper(error)
+    }
+}
+
 impl From<io::Error> for Error {
     fn from(error: io::Error) -> Self {
         Error::Io(error)