Update .travis.yml

Space b/w parentheses and angle bracket gives an error. The Z flag fails the build if there are upload issues so we are notified, https://docs.codecov.io/docs/about-the-codecov-bash-uploader#section-uploading-process

Author: Aadi Bajpai

.travis.yml

@@ -30,4 +30,4 @@ branches:
     - master
 
 after_success:
-  - bash < (curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash) -Z