Update go.mod to 1.16

Sauyon Lee · Sauyon Lee · commit 42939a70b850 · 2021-02-18T11:48:48.000-08:00
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/github/codeql-go
 
-go 1.14
+go 1.16
 
 require (
 	golang.org/x/mod v0.3.0
