diff --git a/.travis.yml b/.travis.yml
index f961273..9e0e9b6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,29 +4,29 @@ addons:
   firefox: latest
   apt:
     sources:
-      - google-chrome
+    - google-chrome
     packages:
-      - google-chrome-stable
+    - google-chrome-stable
 language: node_js
 node_js:
-  - '8'
+- '8'
 cache:
   yarn: true
 branches:
   except:
-    - stable
+  - stable
 before_install:
-  - 'export DISPLAY=:99.0'
-  - sh -e /etc/init.d/xvfb start
-  - npm i -g yarn
+- export DISPLAY=:99.0
+- sh -e /etc/init.d/xvfb start
+- npm i -g yarn
 install:
-  - yarn add @ckeditor/ckeditor5-dev-tests
-  - ckeditor5-dev-tests-install-dependencies
+- yarn add @ckeditor/ckeditor5-dev-tests
+- ckeditor5-dev-tests-install-dependencies
 script:
-  - ckeditor5-dev-tests-travis
+- ckeditor5-dev-tests-travis
 after_success:
-  - ckeditor5-dev-tests-save-revision
+- ckeditor5-dev-tests-save-revision
 env:
   global:
-    - secure: eM+m5vGWUkXz0p2SFQd9XflKBhH8BUrkY8PzQ5wYBWG6irB53k/cTdBcVMeBQR6fe+pN/Rha7VBQOTi1fc9xNbdcAU0iN9NKllEV+MJheGTSD5wkTuHgflNatdste8oD1OUNDeFsAFYpRdN6vO7BSnbiDI5jEOusbAvS/uGE8RLT6O0f6Vfb2fVBxYE43Zlvq8+I7z7QhDw1Gu83cBsSxy3wiW7KlWrLY+hppSgQ4eAopZm/f+aQ+YkTJTjPerQ5Dr1qIOIEgzPSCGO3VaaGIXULq3rxHkx4NaQGfoNe1YNIuuCh5Bt0rPuIN+GlNYB68suT9U0zJQ/Cua2Rvy5h0G0hlIrBLyEJHzBar7YcqoPc+lqWcgSJfYYgnQXzTvpcxRFgwHbDSGhERRuoAf6bJgKprt/pDoavAWogLd0nxSYF3aSb6rcME9CdBlUwqh/iPvY+sOJEWHLCasuSXB2ZbaaF9ltHDbO+p0u1OpjnzlpmA3mG7g53q7TCP6yiiiQ5bBorViR75Y/xNkhjs4wbNvpgi2vdVbPxU0wmcZMWcMblchGKfK5X+HieIgaBuja+P6NWAZaleKr3o0dD3eY99Mq38ivn/LTaXr1k+SVDZLqBauJ4a4+oy9LmxqNwVgiRuhWLmDnOOyFfBG5OznCfzCBfVIo9tdsuSWf8STVo+WU=
-    - secure: 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
+  - secure: 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
+  - secure: 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