Merge pull request #89 from nlopes/dependabot/cargo/prometheus-0.14

Update prometheus requirement from 0.13 to 0.14

Author: nlopes

Cargo.toml

@@ -17,7 +17,7 @@ strfmt = { version = "0.2.4" }
 actix-web = { version = "4.0", default-features = false, features = ["macros"] }
 futures-core = "0.3"
 pin-project-lite = "0.2"
-prometheus = { version = "0.13", default-features = false }
+prometheus = { version = "0.14", default-features = false }
 regex = "^1.4"
 log = "0.4"