dependencies: go get github.com/hashicorp/hcl/v2@v2.5.1

[alisdair]

This includes two hclwrite crash fixes.

• hclwrite: handle legacy dot access of numeric indexes: fixes panic: didn't find any token of type TokenOBrack #5
• hclwrite: Fix panic for dotted full splat (foo.*): fixes panic: didn't find any token of type TokenIdent #7

I verified locally that the above bugs are fixed with this upgrade.

$ ./terraform-clean-syntax 5
2020/05/14 09:42:09 Made changes: 5/main.tf
$ ./terraform-clean-syntax 7
2020/05/14 09:42:10 Made changes: 7/rko.tf

[apparentlymart]

Thanks, and sorry for the delay in merging this!