fix typo

.travis.yml

@@ -4,7 +4,7 @@ python:
     - "2.7.3"
 install:
     - pip install --upgrade pip setuptools wheel
-    - pip intall cython==0.23.4
+    - pip install cython==0.23.4
     - pip install --only-binary=numpy,scipy numpy scipy
     - pip install .
 script: python tests.py