Fix heroku app.json name length validation
Fix heroku app.json name length validation

fabulousu/slack_invite_automation_sinatra,chiyodad/slack_invite_automation_sinatra,allpratik/kumbhathon-slack,seapy/slack_invite_automation_sinatra,chiyodad/slack_invite_automation_sinatra,fabulousu/slack_invite_automation_sinatra,allpratik/kumbhathon-slack,seapy/slack_invite_automation_sinatra