Run first coverage pass with iron-handlers feature enable

Author: mhallin

.travis.yml

@@ -46,8 +46,8 @@ before_deploy:
 after_success:
   - |
     set -e
-    travis-cargo coverage --no-sudo
-    ./kcov/build/src/kcov --verify --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/juniper-* --features iron-handlers
+    travis-cargo coverage --no-sudo -- --features iron-handlers
+    ./kcov/build/src/kcov --verify --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/juniper-*
   
   - |
     if [ "$TRAVIS_BRANCH" = master -a "$TRAVIS_PULL_REQUEST" = false -a "$TRAVIS_RUST_VERSION" = stable ]; then