Use turbo-crc32 package to calcuclate crc32.

Author: reklatsmasters

lib/util.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const crc = require('crc').crc32;
+const crc = require('turbo-crc32/crc32');
 
 module.exports = {
 
@@ -32,6 +32,6 @@ module.exports = {
   },
 
   hash(sess) {
-    return crc(JSON.stringify(sess));
+    return crc(JSON.stringify(sess)) >> 0; // eslint-disable-line no-bitwise
   },
 };

package.json

@@ -27,9 +27,9 @@
   },
   "license": "MIT",
   "dependencies": {
-    "crc": "^3.4.4",
     "debug": "^3.1.0",
     "is-type-of": "^1.0.0",
+    "turbo-crc32": "^1.0.1",
     "uid-safe": "^2.1.3"
   },
   "engines": {