Fix manticore

.travis.yml

@@ -7,9 +7,7 @@ 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 pip install -U pip ; sudo pip install manticore
-- sudo pip uninstall -y Manticore || echo "Manticore not cached"
-- sudo pip install https://github.com/trailofbits/manticore/archive/last_python2.zip
+- sudo pip install -U pip ; sudo pip install https://github.com/trailofbits/manticore/archive/last_python2.zip
 - mkdir build
 - cd build
 - cmake ..