feat:添加铅笔小说搜索插件 (#89)

* feat:添加铅笔小说搜索插件

* fix:小修改help

* fix:微调语句

* fix:替换编码库

* fix:不修改go.sum

utils/encode/encode.go

@@ -0,0 +1,29 @@
+package encode
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	"golang.org/x/text/encoding/simplifiedchinese"
+	"golang.org/x/text/transform"
+)
+
+// GBK 转 UTF-8
+func GbkToUtf8(s []byte) ([]byte, error) {
+	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewDecoder())
+	d, e := ioutil.ReadAll(reader)
+	if e != nil {
+		return nil, e
+	}
+	return d, nil
+}
+
+// UTF-8 转 GBK
+func Utf8ToGbk(s []byte) ([]byte, error) {
+	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewEncoder())
+	d, e := ioutil.ReadAll(reader)
+	if e != nil {
+		return nil, e
+	}
+	return d, nil
+}