Upgrade to Go 1.17 and remove update feature

[dhcgn]

No description provided.

[codecov]

Codecov Report

Merging #7 (fc07bc0) into master (9e0a0e3) will decrease coverage by 2.61%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   61.74%   59.13%   -2.62%     
==========================================
  Files           2        1       -1     
  Lines         149      115      -34     
==========================================
- Hits           92       68      -24     
+ Misses         39       31       -8     
+ Partials       18       16       -2     

Impacted Files	Coverage Δ
cmd/GitLabFileDownloader/main.go	59.13% <100.00%> (-5.00%)	⬇️

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