Merge pull request #1448 from cremno/bison-3.0-pure_parser-warning

fix bison 3.0 warning

src/parse.y

@@ -933,7 +933,7 @@ heredoc_end(parser_state *p)
 
 %}
 
-%pure_parser
+%pure-parser
 %parse-param {parser_state *p}
 %lex-param {parser_state *p}