Update .travis.yml

Author: wannaphong

.travis.yml

@@ -12,6 +12,7 @@ before_install:
 
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
+  - pip install -U numpy
   - pip install -r requirements.txt
   - pip install .[artagger,icu,ipa,ner,thai2fit,deepcut]
   - pip install coveralls