Small fix to example custom-server-typescript (#6695)
Small fix to example custom-server-typescript (#6695)

I noticed that the nodemon.json file was not watching for all file changes in the correct location for filetype .ts (typescript). After some research I found that the "ext" option in the nodemon.json fixes the issue and should work across all operating systems. 
flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,JeromeFitz/next.js,BlancheXu/test,azukaru/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,zeit/next.js,BlancheXu/test,zeit/next.js,BlancheXu/test,JeromeFitz/next.js,flybayer/next.js,zeit/next.js,flybayer/next.js