README.md add AppVeyor CI & Travis CI details
README.md add AppVeyor CI & Travis CI details

jeroenv/cheqroom-plugin-inappbrowser,purplecabbage/cordova-plugin-inappbrowser,FreshGrade/cordova-plugin-inappbrowser,apache/cordova-plugin-inappbrowser,FreshGrade/cordova-plugin-inappbrowser,jeroenv/cheqroom-plugin-inappbrowser,purplecabbage/cordova-plugin-inappbrowser,tbassett44/cordova-plugin-inappbrowser,apache/cordova-plugin-inappbrowser,FreshGrade/cordova-plugin-inappbrowser,tbassett44/cordova-plugin-inappbrowser,jeroenv/cheqroom-plugin-inappbrowser,purplecabbage/cordova-plugin-inappbrowser,jeroenv/cheqroom-plugin-inappbrowser,jeroenv/cheqroom-plugin-inappbrowser,tbassett44/cordova-plugin-inappbrowser,apache/cordova-plugin-inappbrowser