In another sign that Amazon is changing course with Alexa, the company has warned developers that it will soon stop paying them to build Alexa skills. As spotted by Bloomberg, Amazon posted a notice on its Alexa development site noting that it would soon end its seven-year-old program that awarded Amazon Web Services credits to developers who built and published Alexa skills. Amazon will cease issuing AWS credits for Alexa skills after June 30, the notice says. This news story is part of TechHive’s in-depth coverage of the best smart speakers. Bloomberg also reports that Amazon will end monthl…