Fix incorrect licence in version information

src/main.c

@@ -91,6 +91,5 @@ static void hlp(void) {
 static void ver(void) {
 	puts("ESH, version " PROJECT_VERSION);
 	puts("Copyright (C) 2020, Jakob Wakeling");
-	puts("All rights reserved.");
-	puts("OMKOV Permissive Licence (https://www.omkov.net/OLPE)");
+	puts("MIT Licence (https://opensource.org/licenses/MIT)");
 }