Update README.md: toolchain update tip (use-ink#425)

* Update README.md: toolchain update tip * Be more explicit about binary update Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>
xgreenx · Feb 10, 2022 · 1d1dc59 · 1d1dc59
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@@ -51,6 +51,8 @@ More relevant links:
 
 * Step 3: `cargo install --force cargo-contract`.
 
+You can always update the `cargo-contract` binary to the latest version by running the Step 3.
+
 ### Installation using Docker Image
 
 If you prefer to use Docker instead we have a Docker image