Fixed grammatical mistake in README (#1636)

README.md

@@ -80,7 +80,7 @@ Finally, existing bundlers are built around string loaders/transforms, where the
 
 ## How it works
 
-`parcel` transforms a tree of assets to a tree of bundles. Many other bundlers are fundamentally based around JavaScript assets, with other formats tacked on - for example, by default inlined as strings into JS files. `parcel` is file-type agnostic - it will work with any type of assets the way you'd expect, with no configuration.
+`parcel` transforms a tree of assets into a tree of bundles. Many other bundlers are fundamentally based around JavaScript assets, with other formats tacked on - for example, by default inlined as strings into JS files. `parcel` is file-type agnostic - it will work with any type of assets the way you'd expect, with no configuration.
 
 `parcel` takes as input a single entry asset, which could be any file type: JS, HTML, CSS, image, etc. There are various asset types defined in `parcel` which know how to handle specific file types. The assets are parsed, their dependencies are extracted, and they are transformed to their final compiled form. This creates a tree of assets.