revert package.swift to normal deps

Author: tanner0101

Package.swift

@@ -18,7 +18,7 @@ let package = Package(
         .package(url: "https://github.com/vapor/fluent.git", .exact("3.0.0-beta.2")),
 
         // Pure Swift, async/non-blocking client for PostgreSQL.
-        .package(url: "https://github.com/vapor/postgresql.git", .branch("null-encode")),
+        .package(url: "https://github.com/vapor/postgresql.git", .exact("1.0.0-beta.2")),
     ],
     targets: [
         .target(name: "FluentPostgreSQL", dependencies: ["Async", "CodableKit", "Fluent", "FluentSQL", "PostgreSQL"]),