Use all-stable feature in CI instead of --all-features

Cargo.toml

@@ -37,6 +37,9 @@ trybuild = "1.0.23"
 [features]
 default = ["macros"]
 macros = ["ctor", "indoc", "inventory", "paste", "pyo3cls", "unindent"]
+# For CI
+all-stable = ["default", "num-bigint", "num-complex"]
+# Optimizes PyObject to Vec conversion and so on.
 nightly = []
 
 # this is no longer needed internally, but setuptools-rust assumes this feature

Makefile

@@ -16,7 +16,7 @@ fmt:
 
 clippy:
 	@touch src/lib.rs  # Touching file to ensure that cargo clippy will re-check the project
-	cargo clippy --all-features --all-targets -- \
+	cargo clippy --features=all-stable --all-targets -- \
 		$(addprefix -D ,${CLIPPY_LINTS_TO_DENY})
 	for example in examples/*; do (cd $$example/; cargo clippy) || exit 1; done
 

ci/travis/guide.sh

@@ -21,7 +21,7 @@ mdbook build -d ../target/guide guide
 
 # Build the doc
 # This builds the book in target/doc
-cargo doc --all-features --no-deps
+cargo doc --features=all-stable --no-deps
 echo "<meta http-equiv=refresh content=0;url=pyo3/index.html>" > target/doc/index.html
 
 # Get the lastest tag across all branches