v1.2.0

Changelog

98a44c0 add linters, goimports, fix all linters warnings
8cae90a extract lib, parallel download-decode step
9f97a5d feat: goreleaser use
ea2d262 nil pointer panic, when http body absent
e7d3a65 nil pointer panic, when no http response object
8b971c8 parallel decoding and download
393ca17 parallel unlimited download
913f66c small cleanup