[tacker] Proposal for changing IRC timeslot

Hi tacker team, For some members joined our team recently, it's not convenient to attend the IRC meeting since they have another regular meeting at the same time. So I'd like to propose to change the meeting time from Tuesday 8:00 UTC to Monday 8:00 UTC. Let me know if you guys are not convenient, or we'll change the time from next week (16th June). Thanks, Yasufumi