Use both version and path for macro dependency

This will use the path when available and use the version otherwise.
Can be kept in releases and the development repo and will do the
right thing.

(I was very surprised for a while that the main crate wasn't picking
up my changes to the macro.)

epp-client/Cargo.toml

@@ -10,7 +10,7 @@ repository = "https://github.com/masalachai/epp-client"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-epp-client-macros = "0.1" # { path = "../epp-client-macros" }
+epp-client-macros = { version = "0.1", path = "../epp-client-macros" }
 bytes = "1"
 chrono = "0.4"
 env_logger = "0.9"