travis MAINTENANCE travis CI is no longer used
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 4742528..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-language: c
-sudo: required
-dist: xenial
-branches:
-  only:
-    - libyang2
-cache:
-   directories:
-   - $HOME/cache
-
-stages:
-  - name: Coverity
-    if: type = cron
-
-jobs:
-  include:
-    - stage: Coverity
-      name: Coverity night check
-      os: linux
-      compiler: clang
-      env:
-        # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-        #   via the "travis encrypt" command using the project repo's public key
-        - secure: "jkN1i+W2V5/ULAmpqEOyl6J6hsa9rS8JcBKsjB/Md6sJJprWKepUfQ0UdhrjBYbFJbo1mnjL0sHboTrowBXH59IQquPtw64oF9HzyMcmwr+Dm93hhm/vaI06oXwkxmnQxC0OW7Cttrmo+858lsegZYxrh2p4tgEd6WOtDpJIaQ4="
-      addons:
-        coverity_scan:
-          project:
-            name: "CESNET/libyang"
-          notification_email: rkrejci@cesnet.cz
-          build_command_prepend: "mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug .. && make clean"
-          build_command: "make"
-          branch_pattern: libyang2
-      before_install:
-        # check if something changed from the last coverity build
-        - echo "Last coverity build on revision" `cat $HOME/cache/coveritybuild 2>/dev/null`
-        - echo "Current revision" `git rev-parse HEAD`
-        - if [ "`git rev-parse HEAD`" = "`cat $HOME/cache/coveritybuild`" ]; then echo "Codebase did not change from previous build."; travis_terminate 0; fi
-        - if [ ! -d $HOME/cache ]; then echo "Preparing revision cache."; mkdir -p $HOME/cache; fi
-        - git rev-parse HEAD > $HOME/cache/coveritybuild
-        - cat $HOME/cache/coveritybuild
-        - sudo apt-get update -qq
-        - wget https://ftp.pcre.org/pub/pcre/pcre2-10.30.tar.gz
-        - tar -xzf pcre2-10.30.tar.gz
-        - cd pcre2-10.30 && ./configure && make -j2 && sudo -i -- sh -c 'cd /home/travis/build/CESNET/libyang/pcre2-10.30/ && make install' && cd ..
-        # get everything for coverity
-        - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
-        - wget https://entrust.com/root-certificates/entrust_l1k.cer -O - | sudo tee -a /etc/ssl/certs/ca-certificates.crt
-        - export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
-      script:
-        # do nothing, everything here is done in coverity addon
-        - true
-