Bump github.com/hashicorp/hcl/v2 from 2.7.1 to 2.8.1 (#22)

Bumps [github.com/hashicorp/hcl/v2](https://github.com/hashicorp/hcl) from 2.7.1 to 2.8.1.
- [Release notes](https://github.com/hashicorp/hcl/releases)
- [Changelog](https://github.com/hashicorp/hcl/blob/v2.8.1/CHANGELOG.md)
- [Commits](hashicorp/hcl@v2.7.1...v2.8.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -4,6 +4,6 @@ go 1.15
 
 require (
 	github.com/hashicorp/go-version v1.2.1
-	github.com/hashicorp/hcl/v2 v2.7.1
+	github.com/hashicorp/hcl/v2 v2.8.1
 	github.com/terraform-linters/tflint-plugin-sdk v0.6.0
 )

go.sum

@@ -46,6 +46,8 @@ github.com/hashicorp/go-version v1.2.1 h1:zEfKbn2+PDgroKdiOzqiE8rsmLqU2uwi5PB5pB
 github.com/hashicorp/go-version v1.2.1/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/hcl/v2 v2.7.1 h1:eZWfKEO93WyE4OnZSD5LVy70YHDV/mmQ49gpKDLpDVM=
 github.com/hashicorp/hcl/v2 v2.7.1/go.mod h1:bQTN5mpo+jewjJgh8jr0JUguIi7qPHUF6yIfAEN3jqY=
+github.com/hashicorp/hcl/v2 v2.8.1 h1:FJ60CIYaMyJOKzPndhMyjiz353Fd+2jr6PodF5Xzb08=
+github.com/hashicorp/hcl/v2 v2.8.1/go.mod h1:bQTN5mpo+jewjJgh8jr0JUguIi7qPHUF6yIfAEN3jqY=
 github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734 h1:HKLsbzeOsfXmKNpr3GiT18XAblV0BjCbzL8KQAMZGa0=
 github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734/go.mod h1:kNDNcF7sN4DocDLBkQYz73HGKwN1ANB1blq4lIYLYvg=
 github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb h1:b5rjCoWHc7eqmAS4/qyk21ZsHyb6Mxv/jykxvNTkU4M=