Return null when defining a macro

Author: amitayh

package.json

@@ -2,7 +2,7 @@
  "name": "lispjs",
  "version": "1.0.0",
  "description": "Simple Lisp implementation in JavaScript",
- "main": "index.js",
+ "main": "./src/lisp.js",
  "dependencies": {
  "readline-sync": "^1.2.19"
  },
@@ -14,7 +14,6 @@
  "test": "mocha specs/",
  "repl": "node src/repl.js"
  },
- "main": "./src/lisp.js",
  "repository": {
  "type": "git",
  "url": "https://github.com/amitayh/lispjs.git"

src/forms.js

@@ -37,6 +37,7 @@ function defmacro(name, argNames, body) {
  var expanded = evaluate(body, macroEnv);
  return evaluate(expanded, env);
  });
+ return null;
 }
 
 /**