Bump prometheus requirement to 0.6

Ben Sully · Ben Sully · commit 3f01cb034da7 · 2019-05-08T11:29:28.000+01:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -12,7 +12,7 @@ keywords = ["rocket", "prometheus", "instrumentation", "monitoring"]
 readme = "README.md"
 
 [dependencies]
-prometheus = "0.5"
+prometheus = "0.6"
 rocket = "0.4.0"
 
 [dev-dependencies]
