Bump github.com/gorilla/sessions from 1.3.0 to 1.4.0

Bumps [github.com/gorilla/sessions](https://github.com/gorilla/sessions) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/gorilla/sessions/releases)
- [Commits](https://github.com/gorilla/sessions/compare/v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: github.com/gorilla/sessions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/gorilla/feeds v1.1.2
 	github.com/gorilla/mux v1.8.1
 	github.com/gorilla/schema v1.4.1
-	github.com/gorilla/sessions v1.3.0
+	github.com/gorilla/sessions v1.4.0
 	github.com/guregu/null v4.0.0+incompatible
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/ikeikeikeike/go-sitemap-generator/v2 v2.0.2

go.sum

@@ -87,8 +87,8 @@ github.com/gorilla/schema v1.4.1 h1:jUg5hUjCSDZpNGLuXQOgIWGdlgrIdYvgQ0wZtdK1M3E=
 github.com/gorilla/schema v1.4.1/go.mod h1:Dg5SSm5PV60mhF2NFaTV1xuYYj8tV8NOPRo4FggUMnM=
 github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kXD8ePA=
 github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
-github.com/gorilla/sessions v1.3.0 h1:XYlkq7KcpOB2ZhHBPv5WpjMIxrQosiZanfoy1HLZFzg=
+github.com/gorilla/sessions v1.4.0 h1:kpIYOp/oi6MG/p5PgxApU8srsSw9tuFbt46Lt7auzqQ=
-github.com/gorilla/sessions v1.3.0/go.mod h1:ePLdVu+jbEgHH+KWw8I1z2wqd0BAdAQh/8LRvBeoNcQ=
+github.com/gorilla/sessions v1.4.0/go.mod h1:FLWm50oby91+hl7p/wRxDth9bWSuk0qVL2emc7lT5ik=
 github.com/guregu/null v4.0.0+incompatible h1:4zw0ckM7ECd6FNNddc3Fu4aty9nTlpkkzH7dPn4/4Gw=
 github.com/guregu/null v4.0.0+incompatible/go.mod h1:ePGpQaN9cw0tj45IR5E5ehMvsFlLlQZAkkOXZurJ3NM=
 github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=