Update travis config

Author: methane

.travis.yml

@@ -21,7 +21,7 @@ matrix:
       install:
         - pip install -U pip
         - pip install cython
-        - cython --cplus msgpack/_packer.pyx msgpack/_unpacker.pyx
+        - make cython
         - docker pull $DOCKER_IMAGE
       script:
         - docker run --rm -v `pwd`:/io -w /io $DOCKER_IMAGE /io/docker/runtests.sh
@@ -34,19 +34,19 @@ matrix:
       install:
         - pip install -e .
       script:
-        - py.test -v test
+        - pytest -v test
 
 
 install:
   - pip install -U pip
   - pip install cython
-  - cython --cplus msgpack/_packer.pyx msgpack/_unpacker.pyx
+  - make cython
   - pip install -e .
 
 script:
   - python -c 'import sys; print(hex(sys.maxsize))'
-  - python -c 'from msgpack import _packer, _unpacker'
-  - py.test -v test
-  - MSGPACK_PUREPYTHON=x py.test -v test
+  - python -c 'from msgpack import _msgpack'
+  - pytest -v test
+  - MSGPACK_PUREPYTHON=x pytest -v test
 
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