Fix some scoping modifiers

Author: Lamartio

library/src/main/java/nl/elements/objectstore/stores/DatabaseStore.kt

@@ -16,8 +16,8 @@ import writeToBytes
  */
 
 class DatabaseStore(
-    val database: SQLiteDatabase,
-    val table: String = "key_value_store",
+    private val database: SQLiteDatabase,
+    private val table: String = "key_value_store",
     override val converter: Converter = Converter.DEFAULT,
     override val transformer: Transformer = Transformer.DEFAULT
 ) : ObjectStore.Base() {

library/src/main/java/nl/elements/objectstore/stores/DirectoryStore.kt

@@ -12,7 +12,7 @@ import java.io.File
  */
 
 class DirectoryStore(
-    val directory: File,
+    private val directory: File,
     override val converter: Converter = Converter.DEFAULT,
     override val transformer: Transformer = Transformer.DEFAULT
 ) : ObjectStore.Base() {