Drop support for Go 1.15 and Go 1.16

bojanz · bojanz · commit db1cefc8cbbe · 2022-10-03T13:07:49.000+02:00
Now matches bojanz/currency.
diff --git a/go.mod b/go.mod
@@ -1,3 +1,3 @@
 module github.com/bojanz/address
 
-go 1.15
+go 1.17

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`	`1`	`module github.com/bojanz/address`
`2`	`2`
`3`		`-go 1.15`
	`3`	`+go 1.17`