In patch 7.37 for Dota 2, the rewards for killing Roshan were updated.
Released on the night of August 1, patch 7.37 brought numerous balance changes, and adjustments to abilities and items. You can find the full list of updates via the link provided.
Valve also modified Roshan's rewards. Now, after the second death, Roshan always drops the Roshan's Banner. After the third kill, Roshan drops either a Refresher Shard and cheese for the Day or a Refresher Shard and Aghanim’s Blessing for the Night.
Additionally, the developers have strengthened Roshan's Banner in this patch, increasing its radius from 600 to 650.