Update README

Author: m-barthelemy

README.md

@@ -36,7 +36,7 @@ let package = Package(
     ...
     dependencies: [
         ...
-        .package(name: "QueuesFluentDriver", url: "https://github.com/m-barthelemy/vapor-queues-fluent-driver.git", .branch("3.0.0-beta1")),
+        .package(name: "QueuesFluentDriver", url: "https://github.com/m-barthelemy/vapor-queues-fluent-driver.git", from: "3.0.0-beta1"),
         ...
     ],
     targets: [