Fix syntax

Signed-off-by: Michal Čihař <michal@cihar.com>

.travis.yml

@@ -43,8 +43,8 @@ after_script:
   - coveralls
 matrix:
   allow_failures:
-    - python: 2.7
+    - python: "2.7"
       env: DJANGO_PIP="https://www.djangoproject.com/download/1.7c2/tarball/" TRAVIS_DATABASE=sqlite TRAVIS_RUN_TESTS="weblate.trans weblate.lang weblate.accounts"
-    - python: 2.7
+    - python: "2.7"
       env: DJANGO_PIP="Django>=1.6,<1.7" TRAVIS_DATABASE=sqlite TRAVIS_RUN_TESTS="weblate.trans.tests.test_selenium" DO_SELENIUM=1
   fast_finish: true