Fix libraries versions in Cargo
To fix the failing build due to incompatible versions of tokio
and hyper used in  hyper_cgi and this, fix the versions in Cargo.toml
@@ -13,11 +13,11 @@ edition = "2018"
[dependencies]
clap = "2"
futures = "*"
-tokio = {version = "*", features = ["full"] }
+tokio = {version = "0.2.22", features = ["full"] }
tokio-process = "*"
tokio-io = "*"
tokio-util = { version = "0.3.1", features=["compat"] }
-hyper = "*"
+hyper = "0.13"
hyper_cgi = "*"
mime = "*"
base64 = "*"
