all: require go 1.18

[mmcloughlin]

Updates #377

[codecov-commenter]

Codecov Report

Merging #379 (6b05838) into master (4e72ca7) will decrease coverage by 0.30%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
- Coverage   78.13%   77.84%   -0.30%     
==========================================
  Files          99       99              
  Lines       23724    23724              
==========================================
- Hits        18537    18467      -70     
- Misses       5091     5165      +74     
+ Partials       96       92       -4     

Flag	Coverage Δ
integration	22.05% <100.00%> (ø)
unittests	72.86% <0.00%> (-0.34%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gotypes/signature.go	94.78% <100.00%> (ø)
examples/md5x16/md5x16.go	0.00% <0.00%> (-86.42%)	⬇️

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