try removing bazel -s option to make less verbose log in travis

Author: BryanCutler

.travis.yml

@@ -21,30 +21,30 @@ matrix:
         - bash -x ${TRAVIS_BUILD_DIR}/.travis/python.configure.sh
         - pip install pyarrow==0.11.1
       script:
-        - bazel test --noshow_progress --noshow_loading_progress -s --verbose_failures --test_output=errors -- //tensorflow_io/...
+        - bazel test --noshow_progress --noshow_loading_progress --verbose_failures --test_output=errors -- //tensorflow_io/...
     - language: python
       python:
         - 3.4
       before_install:
         - bash -x ${TRAVIS_BUILD_DIR}/.travis/python.configure.sh
       script:
-        - bazel test --noshow_progress --noshow_loading_progress -s --verbose_failures --test_output=errors -- //tensorflow_io/...
+        - bazel test --noshow_progress --noshow_loading_progress --verbose_failures --test_output=errors -- //tensorflow_io/...
     - language: python
       python:
         - 3.5
       before_install:
         - bash -x ${TRAVIS_BUILD_DIR}/.travis/python.configure.sh
         - pip install pyarrow==0.11.1
       script:
-        - bazel test --noshow_progress --noshow_loading_progress -s --verbose_failures --test_output=errors -- //tensorflow_io/...
+        - bazel test --noshow_progress --noshow_loading_progress --verbose_failures --test_output=errors -- //tensorflow_io/...
     - language: python
       python:
         - 3.6
       before_install:
         - bash -x ${TRAVIS_BUILD_DIR}/.travis/python.configure.sh
         - pip install pyarrow==0.11.1
       script:
-        - bazel test --noshow_progress --noshow_loading_progress -s --verbose_failures --test_output=errors -- //tensorflow_io/...
+        - bazel test --noshow_progress --noshow_loading_progress --verbose_failures --test_output=errors -- //tensorflow_io/...
     - language: r
       r:
         - 3.2