Merge pull request #1 from DHTMLX/encoding-problem

[fix] change encoding to utf-8

Author: KolosovAO

src/xml.rs

@@ -36,7 +36,7 @@ impl<'a> Element<'a> {
  }
  pub fn to_xml(&mut self) -> String {
  let mut result = String::new();
- result.push_str(r#"<?xml version="1.0" encoding="ISO-8859-1"?>"#);
+ result.push_str(r#"<?xml version="1.0" encoding="UTF-8"?>"#);
  result.push_str(&self.to_string());
  result
  }