[mod] update core deps with dev deps

.travis.yml

@@ -13,7 +13,6 @@ before_install:
   - npm install -g less grunt-cli
   - ( cd searx/static/themes/oscar;npm install; cd - )
 install:
-  - ./manage.sh update_packages
   - ./manage.sh update_dev_packages
   - pip install coveralls
 script:

manage.sh

@@ -10,6 +10,7 @@ update_packages() {
 }
 
 update_dev_packages() {
+    update_packages
     pip install --upgrade -r "$BASE_DIR/requirements-dev.txt"
 }