message: Use const Dialect in parse_query
diff: @@ -15,12 +15,11 @@ pub fn parse<Sql: AsRef<str>>(sql: Sql) -> Result<Vec<SqlStatement>> {
  }
  pub fn parse_query<Sql: AsRef<str>>(sql_expr: Sql) -> Result<SqlQuery> {
  - let dialect = GenericDialect {};
  - let tokens = Tokenizer::new(&dialect, sql_expr.as_ref())
  + let tokens = Tokenizer::new(&DIALECT, sql_expr.as_ref())
  .tokenize()
  .map_err(|e| Error::Parser(format!("{:#?}", e)))?;
  - Parser::new(tokens, &dialect)
  + Parser::new(tokens, &DIALECT)
  .parse_query()
  .map_err(|e| Error::Parser(format!("{:#?}", e)))
  }
  