Merge pull request #889 from RockerHX/swift4.1

Update to Swift4.1.

Sources/String+MD5.swift

@@ -74,8 +74,13 @@ func arrayOfBytes<T>(_ value: T, length: Int? = nil) -> [UInt8] {
         return bytes
     }
 
+    #if swift(>=4.1)
+    valuePointer.deinitialize(count: 1)
+    valuePointer.deallocate()
+    #else
     valuePointer.deinitialize()
     valuePointer.deallocate(capacity: 1)
+    #endif
     
     return bytes
 }