Fix no Foundation import error

withouth import Foundation sometimes will cause Compile Error

Author: codetalks-new

SQLite/Foundation.swift

@@ -22,6 +22,8 @@
 // THE SOFTWARE.
 //
 
+import Foundation
+
 extension NSData : Value {
 
     public class var declaredDatatype: String {
@@ -101,4 +103,4 @@ extension Row {
         return get(column)
     }
 
-}
+}