Merge #20: ci: Build and test with all features

e5102f4 ci: Build and test with all features (Tobin C. Harding)

Pull request description:

  We test various combinations of features in the feature matrix but somehow we forgot to build and test with `--all-features`. We do lint with all features so this is not a massive fail but its a fail none the less.

  Discovered by Andrew's CI while reviewing recent changes to `corepc`.

ACKs for top commit:
  apoelstra:
    ACK e5102f4

Tree-SHA512: 13939d370d5d1fac58ab7da6424e0cb316e53f0cd920cde10f0f53152c71fab1dd6429a4efb0a3272de7211d684a9f093e80cc7934fd0a0fd450862c770650ef

Author: tcharding

ci/run_task.sh

@@ -184,6 +184,9 @@ do_feature_matrix() {
         $cargo test --no-default-features
     fi
 
+    $cargo build --all-features
+    $cargo test --all-features
+
     if [ -n "${FEATURES_WITH_STD}" ]; then
         loop_features "std" "${FEATURES_WITH_STD}"
     fi