chore: Remove obsolete travis and appveyor CI builds (#289)

diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 7495398..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-language: node_js
-sudo: false
-
-node_js:
-    - 10
-    - 12
-    - 14
-
-install:
-    - npm install
-
-script:
-    - npm test
diff --git a/README.md b/README.md
index 12874e6..07e37e8 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,9 @@
 #
 -->
 
-[![Build Status](https://travis-ci.org/apache/cordova-coho.svg?branch=master)](https://travis-ci.org/apache/cordova-coho)
-[![Build Status](https://ci.appveyor.com/api/projects/status/github/apache/cordova-coho?branch=master)](https://ci.appveyor.com/project/ApacheSoftwareFoundation/cordova-coho)
+[![Node CI](https://github.com/apache/cordova-coho/workflows/Node%20CI/badge.svg?branch=master)](https://github.com/apache/cordova-coho/actions?query=branch%3Amaster)
+[![codecov.io](https://codecov.io/github/apache/cordova-coho/coverage.svg?branch=master)](https://codecov.io/github/apache/cordova-coho?branch=master)
+
 
 # Cordova Coho
 
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index dc43cac..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-# appveyor file
-# http://www.appveyor.com/docs/appveyor-yml
-
-environment:
-  matrix:
-  - nodejs_version: 10
-  - nodejs_version: 12
-
-install:
-  - ps: Install-Product node $env:nodejs_version
-  - npm install
-
-build: off
-
-test_script:
-  - node --version
-  - npm --version
-  - npm test