Remember when IFTTT said it would allow its legacy users to set their own prices for the service’s “pro” plan, and that it would honor those prices “forever”? Well, it turns out “forever” has an expiration date. In a message posted on its website, IFTTT just announced that its pay-what-you-want legacy Pro plans are going away, with current users on that plan slated to be migrated to the $5-a-month IFTTT Pro+ plan at the start of their next billing cycles. In the notice, IFTTT argued that the “Le...