fix: correct repository name in installation instructions

Author: ayanrajpoot10

README.md

@@ -15,8 +15,8 @@ A cross-platform SSH tunneling tool that creates secure connections through dire
 Download the latest binary from the [releases page](../../releases) or build from source:
 
 ```bash
-git clone https://github.com/ayanrajpoot10/Tunn.git
-cd Tunn
+git clone https://github.com/ayanrajpoot10/tunn.git
+cd tunn
 go build
 ```