remove travis ci, we are using gitlab ci now instead

.travis.yml

-sudo: required
-dist: bionic
-language: minimal
-env:
-  matrix:
-    - ARCH=x86_64
-    - ARCH=x86
-    - ARCH=aarch64
-    - ARCH=armhf
-    - ARCH=ppc64le
-
-before_install:
-  - "wget 'https://raw.githubusercontent.com/alpinelinux/alpine-chroot-install/v0.11.0/alpine-chroot-install' \
-        && echo 'df472cbd2dc93eb0b3126d06209363c4fc328ea3  alpine-chroot-install' | sha1sum -c || exit 1"
-  - alpine() { /alpine/enter-chroot -u "$USER" "$@"; }
-install:
-  - sudo sh alpine-chroot-install -a "$ARCH" -b v3.10
-        -p 'build-base alpine-sdk linux-headers lua5.3-dev openssl openssl-dev zlib-dev'
-before_script:
-  - /alpine/enter-chroot sh -c "addgroup $USER wheel && addgroup $USER abuild"
-  - alpine abuild-keygen -ain
-script:
-  - alpine make
-  - alpine src/apk --version
-  - alpine make static
-  - alpine src/apk.static --version
-  - alpine make check
-  - alpine make -C test root-tests
-
-# If building a tagged commit, create and deploy tarball with statically linked
-# apk to GitHub Releases.
-before_deploy:
-  - export PKGNAME="apk-tools-${TRAVIS_TAG#v}"
-  - alpine strip src/apk.static
-  - install -D -m 755 src/apk.static $PKGNAME/apk
-  - tar -czf $PKGNAME-$ARCH-linux.tar.gz $PKGNAME
-  - sha256sum $PKGNAME-$ARCH-linux.tar.gz > $PKGNAME-$ARCH-linux.tar.gz.sha256
-deploy:
-  provider: releases
-  api_key:
-    secure: "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"
-  file: apk-tools-*.tar.gz*
-  file_glob: true
-  skip_cleanup: true
-  on:
-    tags: true
-
-notifications:
-  irc:
-    channels:
-      - "chat.freenode.net#alpine-commits"
-    template:
-      - "%{repository_name}:%{branch} [%{result}] |%{author}| %{commit_subject} | %{build_url}"