feat: update go 1.18

Author: kkweon

go.mod

@@ -1,5 +1,11 @@
 module github.com/codingpot/paperswithcode-go/v2
 
-go 1.16
+go 1.18
 
 require github.com/stretchr/testify v1.7.0
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)