update controle files

.travis.yml

@@ -9,7 +9,7 @@ matrix:
       services: docker
       env: OMP_NUM_THREADS=4
       script:
-        - python -m pip install -U setuptools pytest-cov coveralls coverage~=4.5.4
+        - python -m pip install -U setuptools pytest-cov coveralls
         - python -m pip install -U numpy==1.17.3 cython==0.29.14
         - python -m pip install -r requirements.txt
         - python setup.py sdist -d dist