graph: align the dots with the middle of the first *visible* child element The changelog graph will have invisible first elements when a range is selected. That caused an odd graph. Fixed by adding the :visible selector that was lost in 5258b66bf5d7.

babel >= 0.9.6, < 2.4
waitress >= 0.8.8, < 1.0
pytest ~= 3.0
pytest-runner
pytest-sugar>=0.7.0
pytest-catchlog
pytest-localserver
mock
sphinx
webtest < 3