Migrate to Go 1.16.2

[advancedwebdeveloper]

No description provided.

[mrutkows]

Please also use "go mod edit" to update go.mod to the same version

[advancedwebdeveloper]

Please also use "go edit" to update go.mod to the same version

Hm, I got this:

$ go edit
go edit: unknown command
Run 'go help' for usage.

I am using

$ go version
go version go1.16.2 windows/amd64

[mrutkows]

Please also use "go edit" to update go.mod to the same version

Hm, I got this:

$ go edit
go edit: unknown command
Run 'go help' for usage.

I am using

$ go version
go version go1.16.2 windows/amd64

Sorry, as the README says it is

go mod edit

[mrutkows]

You will also need to update Travis:
https://github.com/apache/openwhisk-wskdeploy/blob/master/.travis.yml

and update the README as well.