Fix typos from review

README.md

@@ -15,7 +15,7 @@ Programming language that compiles to Bash. It's a high level programming langua
 Amber compiler currently works on:
 - Linux x86 and ARM
 - macOS x86 and ARM (Apple Silicon)
-- Nix (NixOs)
+- Nix (NixOS)
 
 ### macOS / Linux
 Make sure that the operating system meets the following prerequisites
@@ -46,7 +46,7 @@ The package is already containing all the required install scripts and dependenc
 {
     inputs = {
         # ...
-        amber.url = "github:brumik/ytsum";
+        amber.url = "github:Ph0enixKM/Amber";
     };
 
     # outputs somewhere
@@ -57,7 +57,7 @@ The package is already containing all the required install scripts and dependenc
 }
 ```
 
-While developing on Nixos the flake also defines all dependencies for `nix develop` (or `direnv` if used).
+While developing with Nix, the flake defines all dependencies for `nix develop` (or `direnv` if used).
 
 ### Windows support
 As windows does not come with bash installed it makes no sense to support it. Please install WSL 2 on your windows machine and install Linux version of Amber compiler inside.