travis: force build fail on autobahn failure

Signed-off-by: Alexey Galakhov <agalakhov@snapview.de>

.travis.yml

@@ -4,6 +4,10 @@ rust:
   - beta
   - nightly
 
+install:
+  - sudo apt-get install python-unittest2
+  - sudo pip install ghp-import urllib3[secure] autobahntestsuite
+
 before_script:
   - export PATH="$PATH:$HOME/.cargo/bin"
   - sudo apt-get install libssl-dev
@@ -21,8 +25,6 @@ script:
   - cargo check --features gio-runtime,async-tls
   - cargo check --features async-std-runtime,async-tls,async-native-tls,tokio-runtime,tokio-tls,gio-runtime
   - cargo test --features async-std-runtime
-
-after_success:
   - sudo apt-get install python-unittest2
   - sudo pip install ghp-import urllib3[secure] autobahntestsuite
   - echo "Running Autobahn TestSuite for client" && ./scripts/autobahn-client.sh