Missing comma in example

[Zymlex]

Example https://github.com/rust-native-ui/libui-rs:

iui = { git = "https://github.com/rust-native-ui/libui-rs.git" branch="trunk" }

Require:

iui = { git = "https://github.com/rust-native-ui/libui-rs.git", branch="trunk" }