use the dependency on argon2 instead of the submodule

Author: Colin Tremblay

Package.swift

@@ -14,26 +14,14 @@ let package = Package(
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
-        // .package(url: /* package url */, from: "1.0.0"),
+        .package(
+            name: "Argon2", 
+            url: "https://github.com/P-H-C/phc-winner-argon2.git", .branch("master")
+        )
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
         // Targets can depend on other targets in this package, and on products in packages this package depends on.
-        .target(
-            name: "Argon2",
-            dependencies: [],
-            path: "Sources/Argon2",
-            exclude: [
-                "Sources/Argon2/kats",
-                "Sources/Argon2/vs2015",
-                "Sources/Argon2/src/blake2/blamka-round-opt.h",
-                "Sources/Argon2/src/run.c",
-                "Sources/Argon2/src/test.c",
-                "Sources/Argon2/src/opt.c",
-                "Sources/Argon2/src/bench.c",
-                "Sources/Argon2/src/genkat.c",
-                "Sources/Argon2/src/genkat.h"
-            ]),
         .target(
             name: "Argon2Swift",
             dependencies: ["Argon2"],