Bump ctrlc from 3.1.3 to 3.1.4 (paritytech#30)

Bumps [ctrlc](https://github.com/Detegr/rust-ctrlc) from 3.1.3 to 3.1.4.
- [Release notes](https://github.com/Detegr/rust-ctrlc/releases)
- [Commits](https://github.com/Detegr/rust-ctrlc/commits/3.1.4)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

bridges/relays/substrate/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 async-std = "1.0.1"
 clap = "2.3.3"
-ctrlc = "3.1.3"
+ctrlc = "3.1.4"
 derive_more = "0.99.3"
 env_logger = "0.7.1"
 futures = "0.3.1"