update changelog

changelogs/v0.13.0.md

@@ -6,7 +6,7 @@ In addition to this new capability, Reactr now officially supports two new langu
 
 Along with new languages, Reactr now officially supports a new underlying WebAssembly runtime, [Wasmtime](https://wasmtime.dev)! This is the first new runtime that we're adding support for, and more will be coming in the future. We want anyone to be able to take advantage of Reactr and Atmo, regardless of underlying runtime!
 
-Finally, Reactr has gotten some signifigant internal performance improvements, specifically around how internal WebAssembly runtimes are managed. The work to support multiple runtimes allowed us to totally re-structure how they are managed, which led to a large improvement for performance and internal design of the scheduler.
+Finally, Reactr has received some significant internal performance improvements, specifically around how internal WebAssembly runtimes are managed. The work to support multiple runtimes was a good opportunity to re-architect the internal workings of the scheduler, leading to some great performance gains.
 
 Beta-13 contains small internal breaking changes, so all users must update their Runnables to use `v0.13.0` of the various language libraries.