Adjust the packages installation location

Author: yetist

.travis.yml

@@ -6,13 +6,13 @@ services:
   - docker
 
 before_install:
-  - sudo apt-get install -y python3-pip python3-setuptools
-  - sudo pip3 install --upgrade pip
-  - sudo pip install PyGithub
   - curl -Ls -o docker-build https://github.com/mate-desktop/mate-dev-scripts/raw/master/travis/docker-build
   - chmod +x docker-build
 
 install:
+  - sudo apt-get install -y python3-pip python3-setuptools
+  - sudo pip3 install --upgrade pip
+  - sudo pip install PyGithub
   - ./docker-build --name ${DISTRO} --config .travis.yml --install
 
 script: