add hmml_version variable

hmmlib/hmmlib.h

@@ -95,4 +95,10 @@ HMML_Output hmml_parse_file (FILE* file);
 void        hmml_dump       (HMML_Output* output);
 void        hmml_free       (HMML_Output* output);
 
+// Version
+
+extern const struct HMML_Version {
+	int Major, Minor, Patch;
+} hmml_version;
+
 #endif

hmmlib/hmmlib.l

@@ -5,6 +5,8 @@
 #include "stb_sb.h"
 #include "hmmlib.h"
 
+	const struct HMML_Version hmml_version = { 0, 1, 0 };
+
 	typedef struct {
 		int    line;
 		HMML_Annotation* annos;