[Tests] drop node requirement to v3

Author: ljharb

.github/workflows/node-aught.yml

@@ -6,6 +6,6 @@ jobs:
   tests:
     uses: ljharb/actions/.github/workflows/node.yml@main
     with:
-      range: '>= 4 < 10'
+      range: '>= 3 < 10'
       type: minors
       command: npm run tests-only

package.json

@@ -30,6 +30,6 @@
   "author": "Dominic Tarr <dominic.tarr@gmail.com> (dominictarr.com)",
   "license": "(MIT AND BSD-3-Clause)",
   "engines": {
-    "node": ">= 4"
+    "node": ">= 3"
   }
 }

test/hash.js

@@ -1,7 +1,10 @@
 'use strict';
 
 var tape = require('tape');
+var Buffer = require('safe-buffer').Buffer;
+
 var Hash = require('../hash');
+
 var hex = '0A1B2C3D4E5F6G7H';
 
 function equal(t, a, b) {

test/test.js

@@ -2,6 +2,8 @@
 
 var crypto = require('crypto');
 var tape = require('tape');
+var Buffer = require('safe-buffer').Buffer;
+
 var Sha1 = require('../').sha1;
 
 var inputs = [