update rgb-lib to 0.3.0-beta.2 + bump to 0.3.0-beta.2

Author: zoedberg

Package.swift

@@ -25,8 +25,8 @@ let package = Package(
 //        .binaryTarget(name: "rgb_libFFI", path: "./rgb_libFFI.xcframework"),
         .binaryTarget(
            name: "rgb_libFFI",
-           url: "https://github.com/RGB-Tools/rgb-lib-swift/releases/download/0.3.0-beta.1/rgb_libFFI.xcframework.zip",
-           checksum: "64499bc8168c59f8f9492bc6fc7b75d2beaa134fef43f6c3d6a0eed94fd3f055"),
+           url: "https://github.com/RGB-Tools/rgb-lib-swift/releases/download/0.3.0-beta.2/rgb_libFFI.xcframework.zip",
+           checksum: "4f73663a455ffebd792c8b9299ad4fe7bd3d7cdb1531e324224433b1a4dc03a1"),
         .target(
             name: "RgbLib",
             dependencies: ["rgb_libFFI"]),

README.md

@@ -33,8 +33,8 @@ For example:
 ```swift
 .binaryTarget(
    name: "rgb_libFFI",
-   url: "https://github.com/RGB-Tools/rgb-lib-swift/releases/download/0.3.0-beta.1/rgb_libFFI.xcframework.zip",
-   checksum: "64499bc8168c59f8f9492bc6fc7b75d2beaa134fef43f6c3d6a0eed94fd3f055"),
+   url: "https://github.com/RGB-Tools/rgb-lib-swift/releases/download/0.3.0-beta.2/rgb_libFFI.xcframework.zip",
+   checksum: "4f73663a455ffebd792c8b9299ad4fe7bd3d7cdb1531e324224433b1a4dc03a1"),
 ```
 
 Commit the changed `Package.swift` file, then tag the commit with the new