fix dependency

Author: chfw

.travis.yml

@@ -11,6 +11,7 @@ python:
   - pypy
 install:
   - pip install -r requirements.txt
+  - pip install git+https://github.com/chfw/pyexcel.git
   - pip install -r tests/requirements.txt --use-mirrors
 script:
   nosetests --rednose --with-cov

requirements.txt

@@ -1,2 +1 @@
 tabulate
-pyexcel