add missing repo links to sub-crate cargo toml files

such that links are available from their crates.io pages to the project repo.

connect/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.3"
 authors = ["Paul Lietar <paul@lietar.net>"]
 description="The discovery and Spotify Connect logic for librespot"
 license="MIT"
+repository = "https://github.com/librespot-org/librespot"
 edition = "2018"
 
 [dependencies.librespot-core]

core/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Paul Lietar <paul@lietar.net>"]
 build = "build.rs"
 description="The core functionality provided by librespot"
 license="MIT"
+repository = "https://github.com/librespot-org/librespot"
 edition = "2018"
 
 [dependencies.librespot-protocol]

metadata/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.3"
 authors = ["Paul Lietar <paul@lietar.net>"]
 description="The metadata logic for librespot"
 license="MIT"
+repository = "https://github.com/librespot-org/librespot"
 edition = "2018"
 
 [dependencies]

playback/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.3"
 authors = ["Sasha Hilton <sashahilton00@gmail.com>"]
 description="The audio playback logic for librespot"
 license="MIT"
+repository = "https://github.com/librespot-org/librespot"
 edition = "2018"
 
 [dependencies.librespot-audio]

protocol/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Paul Liétar <paul@lietar.net>"]
 build = "build.rs"
 description="The protobuf logic for communicating with Spotify servers"
 license="MIT"
+repository = "https://github.com/librespot-org/librespot"
 edition = "2018"
 
 [dependencies]