Delete .travis.yml (#1557)

diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 23acd4e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,71 +0,0 @@
-# Build matrix / environment variables are explained on:
-# http://about.travis-ci.com/docs/user/build-configuration/
-# This file can be validated on: http://www.yamllint.com/
-# Or using the Ruby based travel command line tool:
-# gem install travis --no-rdoc --no-ri
-# travis lint .travis.yml
-language: cpp
-sudo: false
-addons:
-  homebrew:
-    packages:
-    - clang-format
-    - meson
-    - ninja
-    update: false # do not update homebrew by default
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    - llvm-toolchain-xenial-8
-    packages:
-    - clang-format-8
-    - clang-8
-    - valgrind
-matrix:
-  include:
-    - name: Mac clang meson static release testing
-      os: osx
-      osx_image: xcode11
-      compiler: clang
-      env:
-         CXX="clang++"
-         CC="clang"
-         LIB_TYPE=static
-         BUILD_TYPE=release
-      script: ./.travis_scripts/meson_builder.sh
-    - name: Linux xenial clang meson static release testing
-      os: linux
-      dist: xenial
-      compiler: clang
-      env:
-         CXX="clang++"
-         CC="clang"
-         LIB_TYPE=static
-         BUILD_TYPE=release
-         PYTHONUSERBASE="$(pwd)/LOCAL"
-         PATH="$PYTHONUSERBASE/bin:$PATH"
-      # before_install and install steps only needed for linux meson builds
-      before_install:
-          - source ./.travis_scripts/travis.before_install.${TRAVIS_OS_NAME}.sh
-      install:
-           - source ./.travis_scripts/travis.install.${TRAVIS_OS_NAME}.sh
-      script: ./.travis_scripts/meson_builder.sh
-    - name: Linux xenial gcc cmake coverage
-      os: linux
-      dist: xenial
-      compiler: gcc
-      env:
-        CXX=g++
-        CC=gcc
-        DO_Coverage=ON
-        BUILD_TOOL="Unix Makefiles"
-        BUILD_TYPE=Debug
-        LIB_TYPE=shared
-        DESTDIR=/tmp/cmake_json_cpp
-      before_install:
-          - pip install --user cpp-coveralls
-      script: ./.travis_scripts/cmake_builder.sh
-      after_success:
-          - coveralls --include src/lib_json --include include
-notifications:
-  email: false