Fix travis coverage

.travis.yml

@@ -43,8 +43,13 @@ before_deploy:
   - rm -rf target/package/
   - cargo package --verbose
 
-after_success: |
-  travis-cargo coveralls --no-sudo --verify -- --features iron-handlers
+after_success:
+  - |
+    set -e
+    travis-cargo coverage --no-sudo
+    ./kcov/build/src/kcov --verify --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/juniper-* --features iron-handlers
+  
+  - |
     if [ "$TRAVIS_BRANCH" = master -a "$TRAVIS_PULL_REQUEST" = false -a "$TRAVIS_RUST_VERSION" = stable ]; then
       set -e