Readme.md: Make summary about parcel more accurate

`node_modules` can't be transpiled, see parcel-bundler#1655 and parcel-bundler#6306 (comment)

packages/core/parcel/README.md

@@ -14,7 +14,7 @@
 
 - 🚀 **Blazing fast** bundle times - multicore compilation, and a filesystem cache for fast rebuilds even after a restart.
 - 📦 Out of the box support for JS, CSS, HTML, file assets, and more - **no plugins to install**.
-- 🐠 **Automatically transforms modules** using Babel, PostCSS, and PostHTML when needed - even `node_modules`.
+- 🐠 **Automatically transforms modules** using Babel, PostCSS, and PostHTML when needed.
 - ✂️ Zero configuration **code splitting** using dynamic `import()` statements.
 - 🔥 Built in support for **hot module replacement**
 - 🚨 Friendly error logging experience - syntax highlighted code frames help pinpoint the problem.