upload apk to releases

[yshrsmz]

related #42

https://www.slideshare.net/YuNobuoka/android-jenkins-github

[yshrsmz]

waiting upstream release bluelinelabs/Conductor#287

[IzzySoft]

Just wondering, with the last commit being more than a year ago, will there be another release? The last release was almost 2 years ago, so the latest changes might justify another release even if you're no longer developing the app…