chore: add conventional changelog support

Author: cuebit

CHANGELOG.md

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+## [1.2.1](https://github.com/vuex-orm/plugin-soft-delete/compare/v1.2.0...v1.2.1) (2020-03-30)
+
+
+### Improvements
+
+- Add relationship support. Please [refer to the docs](https://vuex-orm.github.io/plugin-soft-delete/guide/usage.html#relationships) for more details. ([#8](https://github.com/vuex-orm/plugin-soft-delete/pull/8))
+
+
+# [1.2.0](https://github.com/vuex-orm/plugin-soft-delete/compare/v1.1.0...v1.2.0) (2020-03-23)
+
+
+### Features
+
+#### A brand new episode of the Vuex ORM Soft Delete plugin.
+
+While the architecture and codebase has undergone a major transplant, the existing scope is left intact to serve existing users.
+
+- Global and model level option configurations.
+  - `softDeleteConfig` can be defined on models to override global options/defaults.
+- Composite Primary Key support.
+- Single and batch delete models.
+- Restore deleted models.
+- Model state indicator through `instance.$trashed()`.
+  - A unified method edition of `instance.$isDeleted` since it's an interchangeable property. 
+- User-defined mutator for the `key` attribute.
+  - Intersect the date value passed as argument or simply return any value to be stored.
+  - Global and per-model configuration.
+- Typescript support.
+- Comprehensive coverage tests.
+
+### Improvements
+
+- `key` attribute uses `Date.now()` instead of `new Date`.
+  - Enables better conditional treatment over string representation and prevents an empty object persisting to the store.
+- Deleting instance updates reference.
+  - Removes the habit of fetching the same record after it's trashed.
+- Allows forceful hydration after deleting and restoring.
+- Eloquent-esque naming conventions for query builder.
+  - `withTrashed` and `onlyTrashed` are consistent with other ORM's.
+- Fixes model serializing that'd ceased functioning since it changed in **@vuex-orm/core**.
+- Compatible with recent releases of **@vuex-orm/core**.
+- Better alignment with **@vuex-orm/core** codebase and API. 
+- Utilises some existing typings from **@vuex-orm/core** for consistency and support. 
+
+### Deprecations
+
+- Query chain method `onlyTrashed` supersedes `trashed`.
+- Model instance method `$softDelete` supersedes `softDelete`.
+
+_All deprecations come with warnings outside production mode._
+
+
+# 1.1.0 (2019-04-15)
+
+
+The whole new version of soft delete plugin.
+
+