exclude sys for doc build (#32)

Author: rex-schilasky

rustecal-pubsub/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustecal-pubsub"
-version = "0.1.2"
+version = "0.1.3"
 authors = ["Rex Schilasky"]
 edition = "2021"
 description = "Publish/Subscribe API for Eclipse eCAL"
@@ -12,9 +12,16 @@ keywords = ["ecal", "ipc", "pubsub", "middleware"]
 categories = ["network-programming", "api-bindings"]
 
 [dependencies]
-rustecal-sys  = { version = "0.1.0", path = "../rustecal-sys" }
+rustecal-sys  = { version = "0.1.0", path = "../rustecal-sys", optional = true }
 rustecal-core = { version = "0.1.0", path = "../rustecal-core" }
 thiserror     = "1.0"
 
 [features]
-default       = []
+# Include sys bindings by default in local builds
+default = ["sys"]
+# Optional feature to enable the rustecal-sys dependency
+sys     = ["rustecal-sys"]
+
+[package.metadata.docs.rs]
+default-features = false
+features = []