Fixed the build

sumagnadas · sumagnadas · commit 0522316ee2bd · 2020-06-16T21:28:56.000+05:30
diff --git a/.travis.yml b/.travis.yml
@@ -38,6 +38,8 @@ addons:
     packages:
       - x11-utils
       - libxkbcommon-x11-0
+      - libxcb-keysyms1-dev
+      - libx11-xcb-dev
       - herbstluftwm
 install:
   - if [ "$TRAVIS_OS_NAME" = "windows" ]; then py -m pip install -r requirements.txt; fi
