update readme

README.md

@@ -38,7 +38,7 @@ Learn Scala macro and abstract syntax tree.
 - Zero dependency, type-safe
 
 ```scala
-"org.bitlap" %% "smt-csv-core" % "<VERSION>" // since 0.5.1
+"org.bitlap" %% "smt-csv-core" % "<VERSION>" // since 0.5.2
 ```
 
 ## csv-derive
@@ -46,7 +46,7 @@ Learn Scala macro and abstract syntax tree.
 - `DeriveCsvConverter` Automatically derive`Converter`instances for Scala`case class`
 
 ```scala
-"org.bitlap" %% "smt-csv-derive" % "<VERSION>" // since 0.5.1
+"org.bitlap" %% "smt-csv-derive" % "<VERSION>" // since 0.5.2
 ```
 
 ## tools

csv-core/src/main/scala/org/bitlap/csv/core/Csvable.scala

@@ -31,7 +31,7 @@ package org.bitlap.csv.core
 trait Csvable[T] {
 
   @InternalApi
-  private[core] def _toCsvString(t: T): String = ""
+  def _toCsvString(t: T): String = ""
 
   def toCsvString: String = ""
 

csv-core/src/main/scala/org/bitlap/csv/core/InternalApi.scala

@@ -24,6 +24,8 @@ package org.bitlap.csv.core
 import scala.annotation.StaticAnnotation
 
 /**
+ * The annotation notes the method should only be used in library.
+ * 
  * @author 梦境迷离
  * @version 1.0,2022/5/1
  */

csv-core/src/main/scala/org/bitlap/csv/core/Scalable.scala

@@ -31,7 +31,7 @@ package org.bitlap.csv.core
 trait Scalable[T] {
 
   @InternalApi
-  private[core] def _toScala(line: String): Option[T] = None
+  def _toScala(line: String): Option[T] = None
 
   def toScala: Option[T] = None
 }