Zapnout template debugging v travisu

[timthelion]

Coverage.py warning: Disabling plug-in 'django_coverage_plugin.DjangoTemplatePlugin' due to an exception:
Traceback (most recent call last):
  File "/home/travis/build/auto-mat/klub/.venv/lib/python3.6/site-packages/coverage/control.py", line 505, in _should_trace_internal
    file_tracer = plugin.file_tracer(canonical)
  File "/home/travis/build/auto-mat/klub/.venv/lib/python3.6/site-packages/django_coverage_plugin/plugin.py", line 173, in file_tracer
    self.debug_checked = check_debug()
  File "/home/travis/build/auto-mat/klub/.venv/lib/python3.6/site-packages/django_coverage_plugin/plugin.py", line 86, in check_debug
    "Template debugging must be enabled in settings."
django_coverage_plugin.plugin.DjangoTemplatePluginException: Template debugging must be enabled in settings.

https://travis-ci.org/auto-mat/klub/jobs/448423096