HERE IS THE ANSWER :D
Apple has updated Developer Relations Intermediate Certificate. Just download the certificate from here and - https://www.apple.com/certificateauthority/AppleWWDRCAG3.cer install it. If it doesn't works have a look on https://developer.apple.com/support/expiration/
The answer was found in this post:
https://developer.apple.com/forums/thread/662300