rename test.py -> plakativ_test.py so that pytest finds it automatically

.travis.yml

@@ -27,4 +27,4 @@ matrix:
 install: pip install wheel PyMuPDF pytest pdfrw
 script:
   - python --version
-  - python -m pytest test.py
+  - python -m pytest

appveyor.yml

@@ -21,7 +21,7 @@ install:
 build: off
 
 test_script:
-  - "%PYTHON%\\python.exe -m pytest test.py"
+  - "%PYTHON%\\python.exe -m pytest"
 
 after_test:
   - "%PYTHON%\\python.exe setup.py bdist_wheel"