chore: set supported minimum go version to 1.18.

ghosind · ghosind · commit c762ea8b9fd7 · 2023-10-26T23:18:13.000+08:00
diff --git a/go.mod b/go.mod
@@ -1,3 +1,3 @@
 module github.com/ghosind/go-assert
 
-go 1.20
+go 1.18

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`	`1`	`module github.com/ghosind/go-assert`
`2`	`2`
`3`		`-go 1.20`
	`3`	`+go 1.18`