add Sync trait to middleware error (#94)
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@ -144,7 +144,7 @@ pub trait FromErr<T> {
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#[async_trait]
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pub trait Middleware: Sync + Send + Debug {
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type Error: Send + Error + FromErr<<Self::Inner as Middleware>::Error>;
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type Error: Sync + Send + Error + FromErr<<Self::Inner as Middleware>::Error>;
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type Provider: JsonRpcClient;
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type Inner: Middleware<Provider = Self::Provider>;
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