Update RxSwift version

Author: raxityo

Package.swift

@@ -24,22 +24,22 @@
 import PackageDescription
 
 let package = Package(
-    name: "OAuthRxSwift",
-    products: [
-        .library(
-            name: "OAuthRxSwift",
-            targets: ["OAuthRxSwift"]
-        ),
-    ],
-    dependencies: [
-      .package(url: "https://github.com/OAuthSwift/OAuthSwift", .upToNextMajor(from: "2.1.2")),
-      .package(url: "https://github.com/ReactiveX/RxSwift", .upToNextMajor(from: "5.1.1")),
-    ],
-    targets: [
-        .target(
-            name: "OAuthRxSwift",
-            dependencies: ["OAuthSwift", "RxSwift"],
-            path: "Sources"
-        ),
-    ]
-)
+  name: "OAuthRxSwift",
+  products: [
+    .library(
+      name: "OAuthRxSwift",
+      targets: ["OAuthRxSwift"]
+    ),
+  ],
+  dependencies: [
+    .package(url: "https://github.com/OAuthSwift/OAuthSwift", .upToNextMajor(from: "2.1.2")),
+    .package(url: "https://github.com/ReactiveX/RxSwift", .upToNextMajor(from: "6.0.0")),
+  ],
+  targets: [
+    .target(
+      name: "OAuthRxSwift",
+      dependencies: ["OAuthSwift", "RxSwift"],
+      path: "Sources"
+    ),
+  ]
+)