fix: URL imports for Node 14 (#289)

Author: danielbankhead

.changeset/strong-cups-listen.md

@@ -0,0 +1,6 @@
+---
+"http-proxy-agent": patch
+"https-proxy-agent": patch
+---
+
+Import `url` instead of `node:url` 🤷‍♂️

packages/http-proxy-agent/src/index.ts

@@ -4,7 +4,7 @@ import * as http from 'http';
 import createDebug from 'debug';
 import { once } from 'events';
 import { Agent, AgentConnectOpts } from 'agent-base';
-import { URL } from 'node:url';
+import { URL } from 'url';
 import type { OutgoingHttpHeaders } from 'http';
 
 const debug = createDebug('http-proxy-agent');

packages/https-proxy-agent/src/index.ts

@@ -4,7 +4,7 @@ import * as http from 'http';
 import assert from 'assert';
 import createDebug from 'debug';
 import { Agent, AgentConnectOpts } from 'agent-base';
-import { URL } from 'node:url';
+import { URL } from 'url';
 import { parseProxyResponse } from './parse-proxy-response';
 import type { OutgoingHttpHeaders } from 'http';