Deprecation of package ioutil in Go 1.16

[abrar71]

the ioutil functions need to be changed to io packages

"io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details. (SA1019)

[q191201771]

Yeah, nice idea.
But if we switch to new functionality, we must update our min dependence of Go from 1.14 to 1.16.
I'm gonna add this issue to the TODO list and do this later.

Any more suggestions, or comparisons?

[abrar71]

You are right, this issue should be added to TODO list for now. Thank you!

[q191201771]

Move to #37

[q191201771]

Done by #264
We've upgraded to Go 1.16 since we needed to use the Go embed feature by feb6ed9