Bump thiserror from 1.0.26 to 1.0.30

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.26 to 1.0.30.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@1.0.26...1.0.30)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

jormungandr/Cargo.toml

@@ -46,7 +46,7 @@ serde_derive = "1.0"
 serde_json = "1.0.59"
 serde_yaml = "0.8"
 structopt = "^0.3"
-thiserror = "1.0.26"
+thiserror = "1.0.30"
 tracing = "0.1"
 tracing-futures = "0.2"
 tracing-gelf = { version = "0.5", optional = true }

modules/blockchain/Cargo.toml

@@ -7,5 +7,5 @@ edition = "2018"
 [dependencies]
 chain-impl-mockchain = { git = "https://github.com/input-output-hk/chain-libs.git", branch = "master" }
 chain-time           = { git = "https://github.com/input-output-hk/chain-libs.git", branch = "master"}
-thiserror = "1.0.26"
+thiserror = "1.0.30"
 lru       = "0.6.6"