Minor changes

.swift-version

@@ -1 +1 @@
-4.0.3
+5.2.4

Package.swift

@@ -1,5 +1,4 @@
-// swift-tools-version:4.0
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+// swift-tools-version:5.2
 
 import PackageDescription
 

Sources/ZeroMQKit/Socket.swift

@@ -109,8 +109,9 @@ public final class Socket {
         return true
     }
     public func send(_ data: Data, mode: SendMode = []) throws -> Bool {
-        var data = data
-        return try data.withUnsafeMutableBytes { bytes in
+        var newData = data
+        
+        return try newData.withUnsafeMutableBytes { bytes in
             return try self.send(bytes, length: data.count, mode: mode)
         }
     }