Update README.md
Co-authored-by: Radek Simko <radek.simko@gmail.com>
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The Terraform core team **recommends against** using `terraform-json` if your
application has any of the following requirements:
-* **Forwards-compatibility**: each version of this library represents a specific
+* **Forward-compatibility**: each version of this library represents a specific
snapshot of the [Terraform JSON output format](https://developer.hashicorp.com/terraform/internals/json-format),
- and it often slightly lags Terraform itself. The library supports
+ and it often slightly lags behind Terraform itself. The library supports
[the 1.x compatibility promises](https://developer.hashicorp.com/terraform/language/v1-compatibility-promises)
but you will need to upgrade the version promptly to use new additions. If you
require full compatibility with future Terraform versions, we recommend