Python 3.5 and 3.7 Windows travis builds timeout

[Madoshakalaka]

here is the build output

Despite line 275: Done. Your build exited with 0.

The build hangs and errors out after 10 minutes of inactivity.

I have found discussions online saying that Windows background process stops the build from finishing. And there is a command that compares windows processes before and after the build

I'm not spending time on this for now. and I have disabled testing on Windows pythno 3.5 and 2.7 since.

Though the support for Python 2.7 is officially dropped. But python 3.5 build is worthwhile to save. So this issue has its value to solve.

I'd appreciate if anyone wants to help.