Modified copyright message with --version.

Author: jgm

src/main.c

@@ -82,7 +82,7 @@ int main(int argc, char *argv[])
 	for (i = 1; i < argc; i++) {
 		if (strcmp(argv[i], "--version") == 0) {
 			printf("cmark %s", CMARK_VERSION_STRING);
-			printf(" - CommonMark converter (c) 2014 John MacFarlane\n");
+			printf(" - CommonMark converter\n(C) 2014, 2015 John MacFarlane\n");
 			exit(0);
 		} else if (strcmp(argv[i], "--sourcepos") == 0) {
 			options |= CMARK_OPT_SOURCEPOS;