update readme

Author: gwbres

README.md

@@ -20,5 +20,5 @@ describes a filter designer and processing ops
 
 ## Licensing
 
-This libraries is part of the [RTK-rs framework](https://github.com/rtk-rs) which
+This library is part of the [RTK-rs framework](https://github.com/rtk-rs) which
 is delivered under the [Mozilla V2 Public](https://www.mozilla.org/en-US/MPL/2.0) license.