Fix test directory in .travis.yml

.travis.yml

@@ -16,7 +16,7 @@ install:
     - pip install zope.testrunner coverage coveralls
     - pip install -U -e .[test,docs]
 script:
-    - coverage run -m zope.testrunner --test-path=src -v
+    - coverage run -m zope.testrunner --test-path=transaction -v
     - cd docs; make doctest
 notifications:
     email: false