update travis, re-add compile time check for xor feature.

Author: Zane Hannan

.travis.yml

@@ -20,7 +20,8 @@ before_script:
 
 script:
   - cargo test
-  - cargo test --all-features
+  - cargo test --no-default-features --features native-tokio
+  - cargo test --no-default-features --features webpki-tokio
   - cargo test --no-default-features
   - bash -c 'if [[ "$TRAVIS_RUST_VERSION" == "$CLIPPY_RUST_VERSION" ]]; then
       cargo clippy -- -D warnings;

src/lib.rs

@@ -22,6 +22,15 @@
 //! # fn main() {}
 //! ```
 
+#[cfg(all(
+    feature = "tokio-runtime",
+    any(not(feature = "rustls-native-certs"), feature = "webpki-roots"),
+    any(not(feature = "webpki-roots"), feature = "rustls-native-certs")
+))]
+compile_error!(
+    "Must enable exactly one of rustls-native-certs (default) or webpki-roots with tokio-runtime! (note: use `default-features = false' in a binary crate for one or other)"
+);
+
 mod connector;
 mod stream;