Update the Package.swift to use 1.1.0+ version of libwebp, not RC version

Author: dreampiggy

Package.swift

@@ -18,7 +18,7 @@ let package = Package(
         // Dependencies declare other packages that this package depends on.
         // .package(url: /* package url */, from: "1.0.0"),
         .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.1.0"),
-        .package(url: "https://github.com/SDWebImage/libwebp-Xcode.git", from: Version(1, 1, 0, prereleaseIdentifiers: ["-rc.2"]))
+        .package(url: "https://github.com/SDWebImage/libwebp-Xcode.git", from: "1.1.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.