Bump django-webtest from 1.9.2 to 1.9.4

[dependabot-preview]

Bumps django-webtest from 1.9.2 to 1.9.4.

Changelog

Sourced from django-webtest's changelog.

1.9.4 (2018-10-27)

• py34 and Django 1.8 are no longer tested (but may works)

• allow to use positionnal args; fixed #89

• remove deprecated pytest.yield_fixture functions. use pytest.fixture instead;
  fixed #88

• Don't add duplicate WebtestUserMiddleware to the list of middlewares in
  WebTestMixin. fixed #87

• restore MIDDLEWARE_CLASSES support; fixed #84

1.9.3 (2018-05-03)

• Passing user=None to get/post/etc. methods will clear a user
  previously set with set_user instead of doing nothing.

• Avoid sharing settings between tests in pytest plugin

• Fix middleware settings name used

Commits

• b12850a Preparing release 1.9.4
• 5985303 changes
• 7bce96f tests are boring: remove py34 / django 1.8
• 7b7b16e enable pip cache on travis
• 0f7bda4 use LoginView for django 2+
• 0479d06 allow positionnal args; fixed #89
• 431e569 remove pytest yield_fixture functions; fixed #88
• dab27f2 Merge pull request #85 from cazino/middleware-classes-support
• e1adeb2 re-skip 3.7 on travis. psql do not work on xenial ?
• b951aea regenerate conf, without sudo..
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #76.