Add note about how packages are resolved (#222)

In the main section it says that using `mint run` will run the latest version of a package which is installed. Then the Mintfile section says that you can use `mint run tool-name` which is the same as above and I was worried that it would run the latest version. (so I added note to clarify that the version would be resolved from the Mintfile) We've got multiple projects over here and are using mint to install / manage package tools on our CI machines.
yonaskolb · Oct 4, 2021 · 30101d2 · 30101d2
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diff --git a/README.md b/README.md
@@ -126,12 +126,14 @@ yonaskolb/[email protected]
 yonaskolb/[email protected]
 ```
 
-Then you can simply run a package with:
+Then you can simply run a package using:
 
 ```sh
 mint run xcodegen
 ```
 
+Note that mint will find the version declared in your Mintfile and run that version, even if you have multiple versions installed.
+
 Or install all the packages (without linking them globally) in one go with:
 
 ```sh