Update the numpy version of travis CI.

.travis.yml

@@ -23,7 +23,7 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; brew cask install android-platform-tools; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get update; sudo apt-get install -y --no-install-recommends android-tools-adb; fi
   - sudo $PIP install setuptools
-  - sudo $PIP install -I "tensorflow==1.8.0" "numpy>=1.14.0" "sh==1.12.14" "pycodestyle==2.4.0" filelock scipy jinja2 pyyaml
+  - sudo $PIP install -I "tensorflow==1.8.0" "numpy==1.14.2" "sh==1.12.14" "pycodestyle==2.4.0" filelock scipy jinja2 pyyaml
 
 jobs:
   include: