Small fix

README.md

@@ -2,7 +2,7 @@
 
 RISC-V Supervisor Binary Interface implementation in Rust; runs on M-mode.
 
-[![crates.io](https://img.shields.io/crates/d/rustsbi.svg)](https://crates.io/crates/rustsbi)
+[![crates.io](https://img.shields.io/crates/v/rustsbi.svg)](https://crates.io/crates/rustsbi)
 
 ## Binary downloads