Bump Go to 1.18

[codecov-commenter]

Codecov Report

Merging #29 (9ea36b1) into master (ecfbb68) will increase coverage by 0.85%. The diff coverage is 86.11%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   73.23%   74.08%   +0.85%     
==========================================
  Files          20       20              
  Lines         467      521      +54     
==========================================
+ Hits          342      386      +44     
- Misses         95      104       +9     
- Partials       30       31       +1     

Impacted Files	Coverage Δ
parser/method.go	86.00% <85.29%> (-1.65%)	:arrow_down:
smali2java.go	55.26% <100.00%> (+3.74%)	:arrow_up:
parser/class.go	100.00% <0.00%> (ø)
parser/super.go	100.00% <0.00%> (ø)
parser/parser.go	0.00% <0.00%> (ø)
parser/return.go	0.00% <0.00%> (ø)
parser/implements.go	100.00% <0.00%> (ø)
parser/final_string.go	100.00% <0.00%> (ø)
parser/i_get_object.go	100.00% <0.00%> (ø)
parser/i_put_object.go	100.00% <0.00%> (ø)
... and 12 more

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