Update README.md

Author: chinmaygarde

Diff for: README.md

@@ -1,6 +1,6 @@
 Notes:
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-* This is the companion repository for the `Flutter on Raspberry Pi (mostly) from Scratch` article.
+* This is the companion repository for the `Flutter on Raspberry Pi (mostly) from Scratch` [article](https://medium.com/flutter/flutter-on-raspberry-pi-mostly-from-scratch-2824c5e7dcb1).
 * This repository is only meant to showcase what a minimal embedder might look like. It is not production ready (and never will be)!
 * Though this repository is based off of the [Raspberry Pi Cross Compilation SDK and GN Sysroot](https://github.com/chinmaygarde/raspberrypi_cross_compilation_sdk) repository. You dont have to use this toolchain or GN.