update address
update address

file:a/README.md -> file:b/README.md
--- a/README.md
+++ b/README.md
@@ -15,3 +15,6 @@
 ## License
 2048 is licensed under the [MIT license.](https://github.com/gabrielecirulli/2048/blob/master/LICENSE.txt)
+## Donations
+I made this in my spare time, and it's hosted on GitHub (which means I don't have any hosting costs), but if you enjoyed the game and feel like you'd like to buy me a coffee, you can me donate at the `1Ec6onfsQmoP9kkL3zkpB6c5sA4PVcXU2i` BTC address. Thank you very much!