etcd provider does not support this method

[lyonnee]

Describe the bug
When I use etcd as provider, I get this error message

To Reproduce

Expected behavior
Can parse my configuration information from etcd

Please provide the following information):

• OS: osx
• Koanf Version v2.0.0
• providers/etcd Version v0.1.1

[jxsl13]

nil checking the returned object is pretty bad imo. The Provider function should return a second error value.

This will lead to defensive programming where you start to distrust returned pointer values.

It would be great if you could provide a way to setup a test environment quickly.

[lyonnee]

@jxsl13
I fully agree with your opinion that judging whether Provider is equal to nil is a very bad approach. I am planning to modify the source code here to initiate PR

[lyonnee]

The new PR is here #217