Update README

Author: koute

README.md

@@ -33,7 +33,7 @@
 
 ## Building
 
-1. Install Rust nightly and the Yarn package manager (for building the GUI)
+1. Install GCC, Rust and the Yarn package manager (for building the GUI)
 2. Build it:
 
         $ cargo build --release -p memory-profiler
@@ -291,9 +291,6 @@ Whenever to use a more intrusive, faster unwinding algorithm; enabled by default
 Setting it to `0` will on average significantly slow down unwinding. This option
 is provided only for debugging purposes.
 
-Currently supported only on Rust nightly; when compiled on stable this option is ignored
-and the shadow stack is never used.
-
 ## Enabling full debug logs
 
 By default the profiler is compiled with most of its debug logs disabled for performance reasons.