upgrade x/crypto

go.mod

 	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/tidwall/buntdb v1.1.4
 	github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208
-	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
+	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
 	golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f // indirect
 	golang.org/x/text v0.3.3
 	gopkg.in/yaml.v2 v2.3.0

go.sum

 golang.org/x/crypto v0.0.0-20200709230013-948cd5f35899/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a h1:vclmkQCjlDX5OydZ9wv8rBCcS0QyQY66Mpf/7BZbInM=
 golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 h1:pLI5jrR7OSLijeIDcmRxNmw2api+jEfxLoykJVice/E=
+golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=

vendor/modules.txt

 # github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208
 ## explicit
 github.com/toorop/go-dkim
-# golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
+# golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
 ## explicit
 golang.org/x/crypto/bcrypt
 golang.org/x/crypto/blowfish