feat: log Node.js version at startup (probot#1346)

Co-authored-by: Gregor Martynus <gregor@martynus.net>

Author: shaftoe

src/index.ts

@@ -314,7 +314,9 @@ export class Probot {
   }
 
   public start() {
-    this.log.info(`Running Probot v${this.version}`);
+    this.log.info(
+      `Running Probot v${this.version} (Node.js: v${process.version})`
+    );
     const port = this.options.port || 3000;
     const { host } = this.options;
     const printableHost = host ?? "localhost";