Update lib.rs

Signed-off-by: Oghenemarho <orukele.dev@gmail.com>

Author: morukele

src/lib.rs

@@ -10,7 +10,7 @@
 //!
 //! ```toml
 //!     [dependencies]
-//!    paystack-rs = "1.2.0"
+//!     paystack-rs = "1.2.0"
 //! ```
 //!
 //! ## Usage