Use pytest-catchlog instead of pytest-capturelog

pytest-capture log seems to have been abandoned in favor
of pytest-catchlog

pytest-catchlog is no longer maintained; pytest-3.0 will emit
warnings about deprecated features, and pytest-catchlog
makes use of the deprecated "pytest_funcarg__" way
to declare fixtures

dev-requirements.txt

@@ -1,7 +1,7 @@
 freezegun
 pretend
 pytest
-pytest-capturelog
+pytest-catchlog
 pytest-timeout
 pytest-xdist
 mock<1.1