Fix typo in the tap command

Change-Id: I763f723ec31cf810bfb1ed7f2a1eb43173ed0c3d

README.md

diff --git a/README.md b/README.md
index b227fac..1f5828f 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 1. Install the GerritForge/gerrit tap
    ```sh
-   brew tag GerritForge/gerrit
+   brew tap GerritForge/gerrit
    ```
 2. Discover the Gerrit versions available
    ```sh