update to go 1.16

go.mod

@@ -1,13 +1,13 @@
 module github.com/spali/go-rscp
 
-go 1.15
+go 1.16
 
 require (
 	github.com/alvaroloes/enumer v1.1.2
 	github.com/azihsoyn/rijndael256 v0.0.0-20200316065338-d14eefa2b66b
 	github.com/cstockton/go-conv v0.0.0-20170524002450-66a2b2ba36e1
 	github.com/go-test/deep v1.0.7
-	github.com/jnovack/flag v1.15.0
+	github.com/jnovack/flag v1.16.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spali/go-slicereader v0.0.0-20201122145524-8e262e1a5127
 )

go.sum

@@ -8,8 +8,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-test/deep v1.0.7 h1:/VSMRlnY/JSyqxQUzQLKVMAskpY/NZKFA5j2P+0pP2M=
 github.com/go-test/deep v1.0.7/go.mod h1:QV8Hv/iy04NyLBxAdO9njL0iVPN1S4d/A3NVv1V36o8=
-github.com/jnovack/flag v1.15.0 h1:ENYkyIpoKg2u57ME6sK0204om4FdXznbuEeLu5bjfJI=
-github.com/jnovack/flag v1.15.0/go.mod h1:k96ecNuM1uCWu77DCU/2ICA05POKE56bl6/KFy3WdME=
+github.com/jnovack/flag v1.16.0 h1:gJC3JVofq/hNGlNfki4NlIWLOiDkaeLNUOCzznCablU=
+github.com/jnovack/flag v1.16.0/go.mod h1:8g1MmrEr03yquMjIe6CYeXUiIsZ46ssYt+o3X7uEjcg=
 github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1 h1:/I3lTljEEDNYLho3/FUB7iD/oc2cEFgVmbHzV+O0PtU=
 github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1/go.mod h1:eD5JxqMiuNYyFNmyY9rkJ/slN8y59oEu4Ei7F8OoKWQ=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=