repl: ignore comments

closes #10

src/main.zig

@@ -137,6 +137,8 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
         } else if (std.mem.eql(u8, line, "quit") or std.mem.eql(u8, line, "q")) {
             std.debug.warn("leaving\n");
             break;
+        } else if (std.mem.startsWith(u8, line, "#")) {
+            continue;
         }
 
         var cmds_parsed = lang.parse(line) catch |err| {