Remove .travis.yml

We don't use travis CI

.travis.yml

-sudo: required
-
-language: cpp
-
-compiler:
-  - gcc
-  - clang
-
-arch:
-  packages:
-    - extra-cmake-modules
-    - kdoctools
-    - python
-    - kitemmodels
-    - kparts
-    - kpty
-    - libarchive
-    - hicolor-icon-theme
-    - p7zip
-    - unzip
-    - zip
-    - lrzip
-    # for GUI tests
-    - xorg-server-xvfb
-    # from AUR:
-    - rar
-    - unarchiver
-  script:
-    - "cmake -DCMAKE_BUILD_TYPE=Debug -DKDE_INSTALL_LIBDIR=lib -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_INSTALL_PREFIX=/usr ."
-    - "make"
-    - "sudo make install"
-    # run the tests using the xvfb-run wrapper
-    # https://bugzilla.redhat.com/show_bug.cgi?id=904851#c5 fixes 'libGL error: failed to load driver: swrast'
-    - "xvfb-run -s \"-screen 0 640x480x24\" ctest --output-on-failure"
-
-script:
-  - "curl -s https://raw.githubusercontent.com/mikkeloscar/arch-travis/master/arch-travis.sh | bash"