[Add] added travis script

.travis.yml

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+language: python
+python:
+  - "3.7"
+install:
+  - pip install -r requirements.txt
+  - pip install -r requirements-travis.txt
+  - pip install -r requirements-dev.txt
+# command to run tests
+script:
+  - yapf --style .style.yapf
+  - pylint --rcfile=.pylintrc vnpy
+  - python tests/test_all.py

requirements-dev.txt

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+pylint
+https://github.com/google/yapf/archive/master.zip

tests/test_all.py

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+import unittest
+
+if __name__ == '__main__':
+    unittest.main()