Anotates versions for dependencies

Patch number has been left unspecified so that users will always use the
most recent backward-compatible version.

Author: Sasha

Cargo.toml

@@ -7,6 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dyn-clone = "*"
-nom = "*"
-rand = "*"
+dyn-clone = "1.0"
+nom = "5.1"
+rand = "0.7"