Update CHANGELOG.

CHANGELOG.md

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+# 0.3.0 (Unreleased)
+
+BREAKING CHANGES:
+* Methods on the `tfsdk.Config`, `tfsdk.Plan`, and `tfsdk.State` types now return `[]*tfprotov6.Diagnostic` instead of `error` ([#82](https://github.com/hashicorp/terraform-plugin-framework/issues/82))
+* Most uses of `[]*tfprotov6.Diagnostic` have been replaced with a new `diag.Diagnostics` type. Please update your type signatures, and use one of the `diags.New*` helper functions instead of constructing `*tfprotov6.Diagnostic`s by hand. ([#110](https://github.com/hashicorp/terraform-plugin-framework/issues/110))
+* The `schema.Attribute` and `schema.Schema` types have been moved to `tfsdk.Attribute` and `tfsdk.Schema`. No changes beyond import names are required. ([#77](https://github.com/hashicorp/terraform-plugin-framework/issues/77))
+* With the release of Go 1.17, Go 1.17 is now the lowest supported version of Go to use with terraform-plugin-framework. ([#104](https://github.com/hashicorp/terraform-plugin-framework/issues/104))
+* `attr.Value` implementations must now implement a `Type(context.Context)` method that returns the `attr.Type` that created the `attr.Value`. ([#119](https://github.com/hashicorp/terraform-plugin-framework/issues/119))
+
+FEATURES:
+* Added support for ModifyPlan functions on Resources. ([#90](https://github.com/hashicorp/terraform-plugin-framework/issues/90))
+* Introduced first-class diagnostics (`diag` package). ([#110](https://github.com/hashicorp/terraform-plugin-framework/issues/110))
+* Support `attr.Type` validation ([#82](https://github.com/hashicorp/terraform-plugin-framework/issues/82))
+* tfsdk: Attributes, Data Sources, Providers, and Resources now support configuration validation ([#75](https://github.com/hashicorp/terraform-plugin-framework/issues/75))
+
+ENHANCEMENTS:
+* Added a `tfsdk.ValueAs` helper that allows accessing an `attr.Value` without type assertion, by using the same reflection rules used in the `Config.Get`, `Plan.Get`, and `State.Get` helpers. ([#119](https://github.com/hashicorp/terraform-plugin-framework/issues/119))
+* Errors from methods on the `tfsdk.Config`, `tfsdk.Plan`, and `tfsdk.State` types now include rich diagnostic information ([#82](https://github.com/hashicorp/terraform-plugin-framework/issues/82))
+* tfsdk: Validate `Attribute` defines at least one of `Required`, `Optional`, or `Computed` ([#111](https://github.com/hashicorp/terraform-plugin-framework/issues/111))
+
+BUG FIXES:
+* tfsdk: Diagnostics returned from `(Plan).SetAttribute()` and `(State).SetAttribute()` reflection will now properly include attribute path ([#133](https://github.com/hashicorp/terraform-plugin-framework/issues/133))
+* tfsdk: Don't attempt validation on the nested attributes of a null or unknown `SingleNestedAttribute` ([#118](https://github.com/hashicorp/terraform-plugin-framework/issues/118))
+* tfsdk: Return warning diagnostic when using `Attribute` or `Schema` type `DeprecationMessage` field ([#93](https://github.com/hashicorp/terraform-plugin-framework/issues/93))
+
 # 0.2.0 (July 22, 2021)
 
 ENHANCEMENTS: