Add TooManyConsumers variant to track latest sp-runtime addition (#360)

src/error.rs

@@ -107,6 +107,9 @@ pub enum RuntimeError {
     /// There are no providers so the account cannot be created.
     #[error("There are no providers so the account cannot be created.")]
     NoProviders,
+    /// There are too many consumers so the account cannot be created.
+    #[error("There are too many consumers so the account cannot be created.")]
+    TooManyConsumers,
     /// Bad origin.
     #[error("Bad origin: throw by ensure_signed, ensure_root or ensure_none.")]
     BadOrigin,
@@ -141,6 +144,7 @@ impl RuntimeError {
             DispatchError::CannotLookup => Ok(Self::CannotLookup),
             DispatchError::ConsumerRemaining => Ok(Self::ConsumerRemaining),
             DispatchError::NoProviders => Ok(Self::NoProviders),
+            DispatchError::TooManyConsumers => Ok(Self::TooManyConsumers),
             DispatchError::Arithmetic(_math_error) => {
                 Ok(Self::Other("math_error".into()))
             }