Fix disassembly wrong name for main

src/disassembler.rs

@@ -353,10 +353,14 @@ impl Disassembler {
     }
 
     fn disasm_method(&mut self, i: i32, pc: usize, args: usize, vars: usize) -> Result<Method> {
-        let name = self
-            .symbols
-            .lookup_method(pc)
-            .unwrap_or_else(|| format!("func_{}", i));
+
+        let name = if pc == 0 {
+            "main".to_string()
+        } else {
+            self.symbols
+                .lookup_method(pc)
+                .unwrap_or_else(|| format!("func_{}", i))
+        };
         let mut method = Method::new(name, pc, args, vars);
 
         while self.text.has_i8() && !self.is_method(self.text.cur()) {