Update installation.md

Author: dinncer

installation.md

@@ -8,10 +8,10 @@ nav_order: 2
 # Installation
 {: .no_toc }
 
-Before install this package, you should have **PHP** installed on your machine.
+Before install this package, you should have **PHP >= 7.x** installed on your machine.
 {: .fs-6 .fw-300 }
 
 * Download standalone binary from [releases](https://github.com/bb-cli/bb-cli/releases)
-* Move downloaded file to path like `mv bb.phar /usr/local/bin/bb`
+* Move downloaded file to path like `mv bb /usr/local/bin/bb`
 * For testing `bb help`
-* Let's move on to the [auth.](/authentication)
+* Let's move on to the [auth.](/authentication)