Merge branch 'insensitive-login' into 'next'

Case insensitive username login

Closes #248

See merge request famedly/conduit!323

src/client_server/session.rs

@@ -52,7 +52,7 @@ pub async fn login_route(
             password,
         }) => {
             let username = if let IncomingUserIdentifier::MatrixId(matrix_id) = identifier {
-                matrix_id
+                matrix_id.to_lowercase()
             } else {
                 return Err(Error::BadRequest(ErrorKind::Forbidden, "Bad login type."));
             };