Fix Boost Hub link

Closes GH-181.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

readme.md

@@ -81,8 +81,8 @@ Support this effort and give back by sponsoring on [OpenCollective][collective]!
   <a href="https://expo.io"><img src="https://avatars1.githubusercontent.com/u/12504344?s=128&v=4" width="64"></a>
 </td>
 <td width="10%" align="center">
-  <a href="https://boosthub.io">Boost Hub</a><br><br>
-  <a href="https://boosthub.io"><img src="https://images.opencollective.com/boosthub/6318083/logo/128.png" width="64"></a>
+  <a href="https://boostnote.io">Boost Note</a><br><br>
+  <a href="https://boostnote.io"><img src="https://images.opencollective.com/boosthub/6318083/logo/128.png" width="64"></a>
 </td>
 <td width="10%" align="center">
   <a href="https://www.holloway.com">Holloway</a><br><br>