Update README.md

Fix #8

Author: elfmimi

README.md

@@ -37,8 +37,6 @@ to generate a new project from the template.
 
 ## Developing the algorithm
 
-Building requires nightly Rust.
-
 Just run `cargo run`. It spits out the flash algo in the probe-rs YAML format and downloads it onto a target and makes a test run.
 You will also be able to see RTT messages.