- upgrade all node dependencies

```
    "@octokit/rest": "^20.0.1",
    "node-fetch": "^3.3.2",
```

pr-collector/src/prCollector.ts

@@ -6,6 +6,7 @@ import {failOrError} from './utils'
 import {HttpsProxyAgent} from 'https-proxy-agent'
 import {PullRequestInfo, PullRequests} from './pullRequests'
 import {Commits, DiffInfo} from './commits'
+import fetch from 'node-fetch'
 
 export interface Options {
   owner: string // the owner of the repository
@@ -61,7 +62,10 @@ export class PullRequestCollector {
     // load octokit instance
     const octokit = new Octokit({
       auth: `token ${this.token || process.env.GITHUB_TOKEN}`,
-      baseUrl: `${this.baseUrl || 'https://api.github.com'}`
+      baseUrl: `${this.baseUrl || 'https://api.github.com'}`,
+      request: {
+        fetch
+      }
     })
 
     if (proxy) {