Bumped Go to 1.17

[allaryin]

Updated go to 1.17, the change should be largely trivial - just updated go.mod and circleci image references to use 1.17 instead of 1.16.

[hypnoglow]

That's great, thanks!

Could you please also update Dockerfile - it still uses Go 1.15, it seems it was forgotten in 1.16 update.

[codecov]

Codecov Report

Merging #170 (270dd44) into master (020d7c7) will not change coverage.
The diff coverage is n/a.

❗ Current head 270dd44 differs from pull request most recent head 9738491. Consider uploading reports for the commit 9738491 to get more accurate results

@@           Coverage Diff           @@
##           master     #170   +/-   ##
=======================================
  Coverage   45.27%   45.27%           
=======================================
  Files          18       18           
  Lines         466      466           
=======================================
  Hits          211      211           
  Misses        245      245           
  Partials       10       10           

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