make docopt usage non-const (#8189)
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@ -33,7 +33,7 @@ use docopt::Docopt;
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use ethkey::{KeyPair, Random, Brain, BrainPrefix, Prefix, Error as EthkeyError, Generator, sign, verify_public, verify_address, brain_recover};
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use rustc_hex::{FromHex, FromHexError};
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pub const USAGE: &'static str = r#"
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const USAGE: &'static str = r#"
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Ethereum keys generator.
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Copyright 2016, 2017 Parity Technologies (UK) Ltd
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