Update .travis.yml

.travis.yml

@@ -7,10 +7,9 @@ install:
 - pip install pyflakes
 - sudo apt-get -y update
 - sudo apt-get -y install build-essential gcc-multilib cmake python python-pip python-setuptools libffi-dev
-- sudo pip2 install -U pip 
-- wget https://github.com/trailofbits/manticore/archive/last_python2.zip
-- unzip last_python2.zip
-- cd manticore-last_python2 ; python2 setup.py install --user ; cd -
+- sudo pip2 install -U pip
+- sudo pip install z3-solver
+- sudo pip install https://github.com/trailofbits/manticore/archive/last_python2.zip
 - mkdir build
 - cd build
 - cmake ..