Puts the write function as public

LeStorage/MicroStorage.swift

@@ -38,7 +38,7 @@ public class MicroStorage<T : MicroStorable> {
         self.write()
     }
     
-    func write() {
+    public func write() {
         do {
             let jsonString: String = try self.item.jsonString()
             let _ = try FileUtils.writeToDocumentDirectory(content: jsonString, fileName: T.fileName)