Merge pull request #8 from 5sw/master

Update for Swift 4/5

Sources/SwiftSerial.swift

@@ -386,7 +386,7 @@ extension SerialPort {
     public func readData(ofLength length: Int) throws -> Data {
         let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: length)
         defer {
-            buffer.deallocate(capacity: length)
+            buffer.deallocate()
         }
 
         let bytesRead = try readBytes(into: buffer, size: length)
@@ -425,7 +425,7 @@ extension SerialPort {
         var data = Data()
         let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: 1)
         defer {
-            buffer.deallocate(capacity: 1)
+            buffer.deallocate()
         }
 
         while true {
@@ -461,7 +461,7 @@ extension SerialPort {
         let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: 1)
 
         defer {
-            buffer.deallocate(capacity: 1)
+            buffer.deallocate()
         }
 
         while true {
@@ -498,7 +498,7 @@ extension SerialPort {
         let size = data.count
         let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: size)
         defer {
-            buffer.deallocate(capacity: size)
+            buffer.deallocate()
         }
 
         data.copyBytes(to: buffer, count: size)