Ensure docs.rs defaults to present macos docs

Author: mitchmindtree

Cargo.toml

@@ -23,3 +23,8 @@ core_midi = ["coreaudio-sys/core_midi"]
 [dependencies]
 bitflags = "1.0"
 coreaudio-sys = { version = "0.2", default-features = false }
+
+[package.metadata.docs.rs]
+all-features = true
+default-target = "x86_64-apple-darwin"
+targets = ["x86_64-apple-darwin", "x86_64-apple-ios"]