Remove cargo-edit reference from README (#633)

Author: robjtede

README.md

@@ -13,8 +13,6 @@ The binary representation consists of a 96 bit integer number, a scaling factor
 
 ## Installing
 
-Using [`cargo-edit`](https://crates.io/crates/cargo-edit):
-
 ```sh
 $ cargo add rust_decimal
 ```
@@ -367,4 +365,4 @@ there are alternative implementations that may be worth investigating, such as:
 
 If you have further questions about the suitability of this library for your project, then feel free to either start a 
 [discussion](https://github.com/paupino/rust-decimal/discussions) or open an [issue](https://github.com/paupino/rust-decimal/issues) and we'll
-do our best to help.
+do our best to help.