parser yang BUGFIX read UTF-8 characters

Fixes: #160
diff --git a/src/parser_yang_lex.h b/src/parser_yang_lex.h
index 945ea0b..3054231 100644
--- a/src/parser_yang_lex.h
+++ b/src/parser_yang_lex.h
@@ -231,6 +231,7 @@
 #define COMMENT2 2
 #define PATH 3
 #define DOUBLEQUOTES 4
+#define SINGLEQUOTES 5
 
 #endif
 
@@ -357,6 +358,6 @@
 #undef YY_DECL
 #endif
 
-#line 361 "parser_yang_lex.h"
+#line 362 "parser_yang_lex.h"
 #undef yyIN_HEADER
 #endif /* yyHEADER_H */