Bump http from 0.1.18 to 0.1.19

Bumps [http](https://github.com/hyperium/http) from 0.1.18 to 0.1.19.
- [Release notes](https://github.com/hyperium/http/releases)
- [Changelog](https://github.com/hyperium/http/blob/master/CHANGELOG.md)
- [Commits](hyperium/http@v0.1.18...v0.1.19)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Cargo.lock

@@ -14,7 +14,7 @@ serde_derive = "1"
 serde_json = "1"
 hyper = "0.12"
 headers = "0.2.3"
-http = "0.1.18"
+http = "0.1.19"
 chrono = "0.4"
 rmp-serde = "0.14.0"
 semver = "0.9"