Update README about precedence of two --use flags

Author: Strengthless

README.md

@@ -165,7 +165,8 @@ team.
 
 - `--use-bun`
 
-  Similar to --use-yarn, but for bun.
+  Similar to --use-yarn, but for bun. If both --use-yarn and --use-bun are
+  specified, --use-yarn takes precedence.
 
 - `--exclude <regexp>`
 

src/index.ts

@@ -204,7 +204,8 @@ Usage:
         
     ${chalk.bold("--use-bun")}
     
-        Similar to --use-yarn, but for bun.
+        Similar to --use-yarn, but for bun. If both --use-yarn and --use-bun are
+        specified, --use-yarn takes precedence.
 
     ${chalk.bold("--exclude <regexp>")}