update readme

classes/caching/file_system_cache.js

@@ -26,4 +26,4 @@ module.exports = class FileSystemCache {
       this.keyTimeout.updateTimeout(key, this.ttl, () => this.remove(key));
     }
   }
-}
+};

classes/caching/key_timeout.js

@@ -13,4 +13,4 @@ module.exports = class KeyTimeout {
       callback();
     }, durationMs);
   }
-}
+};

classes/caching/memory_cache.js

@@ -4,14 +4,7 @@ module.exports = class MemoryCache {
   constructor(options = {}) {
     this.ttl = options.ttl;
     this.keyTimeout = new KeyTimeout();
-
-    if (options.global && !globalThis.nodeFetchCache) {
-      globalThis.nodeFetchCache = {};
-    }
-
-    this.cache = options.global
-      ? globalThis.nodeFetchCache
-      : {};
+    this.cache = {};
   }
 
   get(key) {
@@ -30,4 +23,4 @@ module.exports = class MemoryCache {
       this.keyTimeout.updateTimeout(key, this.ttl, () => this.remove(key));
     }
   }
-}
+};

classes/response.js

@@ -1,4 +1,3 @@
-const fs = require('fs');
 const stream = require('stream');
 const Headers = require('./headers.js');