Update for 0.2.0 release of Swift OpenAPI

Author: 0xTim

Package.swift

@@ -14,7 +14,7 @@ let package = Package(
         .library(name: "OpenAPIVapor", targets: ["OpenAPIVapor"])
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-openapi-runtime.git", .upToNextMinor(from: "0.1.0")),
+        .package(url: "https://github.com/apple/swift-openapi-runtime", "0.1.3" ..< "0.3.0"),
         .package(url: "https://github.com/vapor/vapor.git", from: "4.0.0")
     ],
     targets: [