ci: remove travis & appveyor (#91)

diff --git a/.appveyor.yml b/.appveyor.yml
deleted file mode 100644
index ccb9fed..0000000
--- a/.appveyor.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-# appveyor file
-# http://www.appveyor.com/docs/appveyor-yml
-
-max_jobs: 1
-
-shallow_clone: true
-
-init:
-  - git config --global core.autocrlf true
-
-image:
-  - Visual Studio 2017
-
-environment:
-  matrix:
-    - nodejs_version: "10"
-    - nodejs_version: "12"
-    - nodejs_version: "14"
-
-platform:
-  - x86
-  - x64
-
-install:
-  - ps: Install-Product node $env:nodejs_version
-  - node --version
-  - npm install -g cordova-paramedic@https://github.com/apache/cordova-paramedic.git
-  - npm install -g cordova
-
-build: off
-
-test_script:
-  - cordova-paramedic --config pr\windows-10-store --plugin . --justBuild
diff --git a/.npmignore b/.npmignore
index 45e3c38..2657abf 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,3 +1,2 @@
 .*
-appveyor.yml
 tests
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index aeebd0c..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,120 +0,0 @@
-# This Travis configuration file is built after a Cordova Paramedic
-# specific template with minimal modifications and adaptations:
-# https://github.com/apache/cordova-paramedic/blob/master/.travis.yml
-
-sudo: false
-
-addons:
-  jwt:
-    # SAUCE_ACCESS_KEY
-    secure: gMxejQseRVRfUnS9dl5Un9fgbQafs0WDwyesZxhaVc1+LL8NI0NTBc7uP5xBBIqjrp+e8ciHVkKMGvEb/SMX5HmWdO6Wn7TREGJeN2ucuiyZP0SXd1vmSJ/FsMYcHKrqnj10KvSHvvZJFk2PUw1f99/KDyCVkXvPZM3P+lQCGPY=
-
-env:
-  global:
-    - SAUCE_USERNAME=snay
-    - TRAVIS_NODE_VERSION=12
-    - ANDROID_API_LEVEL=29
-    - ANDROID_BUILD_TOOLS_VERSION=29.0.2
-
-language: node_js
-node_js: 14
-
-# yaml anchor/alias: https://medium.com/@tommyvn/travis-yml-dry-with-anchors-8b6a3ac1b027
-
-_ios: &_ios
-  os: osx
-  osx_image: xcode11.6
-
-_android: &_android
-  language: android
-  os: linux
-  jdk: oraclejdk8
-  android:
-    components:
-      - tools
-      - build-tools-$ANDROID_BUILD_TOOLS_VERSION
-      - android-$ANDROID_API_LEVEL
-    licenses:
-      - "android-sdk-preview-license-.+"
-      - "android-sdk-license-.+"
-      - "google-gdk-license-.+"
-
-matrix:
-  include:
-    # local tests, without saucelabs
-    - env: PLATFORM=local/browser
-      <<: *_ios
-    - env: PLATFORM=local/ios-10.0
-      <<: *_ios
-
-    # many tests with saucelabs
-    - env: PLATFORM=browser-chrome
-    - env: PLATFORM=browser-firefox
-    - env: PLATFORM=browser-safari
-    - env: PLATFORM=browser-edge
-
-    - env: PLATFORM=ios-11.3
-      <<: *_ios
-    - env: PLATFORM=ios-12.0
-      <<: *_ios
-    - env: PLATFORM=ios-12.2
-      <<: *_ios
-
-    - env: PLATFORM=android-5.1
-      <<: *_android
-    - env: PLATFORM=android-6.0
-      <<: *_android
-    - env: PLATFORM=android-7.0
-      <<: *_android
-    - env: PLATFORM=android-7.1
-      <<: *_android
-    - env: PLATFORM=android-8.0
-      <<: *_android
-    - env: PLATFORM=android-8.1
-      <<: *_android
-    - env: PLATFORM=android-9.0
-      <<: *_android
-
-before_install:
-  # manually install Node for `language: android`
-  - if [[ "$PLATFORM" =~ android ]]; then nvm install $TRAVIS_NODE_VERSION; fi
-  - node --version
-  - if [[ "$PLATFORM" =~ android ]]; then gradle --version; fi
-  - if [[ "$PLATFORM" =~ ios ]]; then npm install -g ios-deploy; fi
-  - npm install -g cordova
-  # install paramedic if not running on paramedic repo
-  - if ! [[ "$TRAVIS_REPO_SLUG" =~ cordova-paramedic ]]; then npm install -g github:apache/cordova-paramedic; fi
-
-install:
-  - npm install
-
-before_script:
-  - |
-    if [[ "$TRAVIS_REPO_SLUG" =~ cordova-paramedic ]]; then 
-      # when used in the cordova-paramedic repo
-      TEST_COMMAND="npm run eslint"
-      PARAMEDIC_PLUGIN_TO_TEST="./spec/testable-plugin/"
-      PARAMEDIC_COMMAND="node main.js"
-    else 
-      # when used in any other (plugin) repo
-      TEST_COMMAND="npm test"
-      PARAMEDIC_PLUGIN_TO_TEST=$(pwd)
-      PARAMEDIC_COMMAND="cordova-paramedic"
-    fi
-  - PARAMEDIC_BUILDNAME=travis-$TRAVIS_REPO_SLUG-$TRAVIS_JOB_NUMBER
-  - |
-    echo "Variables now are set to:"
-    echo "TEST_COMMAND=$TEST_COMMAND"
-    echo "ADDITIONAL_TESTS=$ADDITIONAL_TESTS"
-    echo "PARAMEDIC_COMMAND=$PARAMEDIC_COMMAND"
-    echo "PLATFORM=$PLATFORM"
-    echo "PARAMEDIC_PLUGIN_TO_TEST=$PARAMEDIC_PLUGIN_TO_TEST"
-    echo "PARAMEDIC_BUILDNAME=$PARAMEDIC_BUILDNAME"
-script:
-  - $TEST_COMMAND
-  - |
-    if [[ "$ADDITIONAL_TESTS_DIR" != "" ]]; then
-      cd $ADDITIONAL_TESTS_DIR && npm install && npm test;
-    else
-      $PARAMEDIC_COMMAND --config ./pr/$PLATFORM --plugin $PARAMEDIC_PLUGIN_TO_TEST --buildName $PARAMEDIC_BUILDNAME;
-    fi
diff --git a/README.md b/README.md
index e534833..d8bd01c 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,6 @@
 #         under the License.
 -->
 
-|AppVeyor|Travis CI|
-|:-:|:-:|
-|[![Build status](https://ci.appveyor.com/api/projects/status/github/apache/cordova-plugin-battery-status?branch=master)](https://ci.appveyor.com/project/ApacheSoftwareFoundation/cordova-plugin-battery-status)|[![Build Status](https://travis-ci.org/apache/cordova-plugin-battery-status.svg?branch=master)](https://travis-ci.org/apache/cordova-plugin-battery-status)|
-
 # cordova-plugin-battery-status
 
 This plugin provides an implementation of an old version of the [Battery Status Events API][w3c_spec]. It adds the following three events to the `window` object: