CHANGELOG: Create, add a description of all the versions

CHANGELOG.md

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+# 0.4.1
+
+📜 Added this file, a changelog for the versions.
+
+# 0.4.0
+
+🚀 Support for create/read/update/delete of ImprovMX SMTP credentials.
+
+# 0.3.0
+
+🐛 Fix email forward imports, previously we weren't setting all the fields.
+🐛 Return API 404s to the user, don't infinitely loop waiting for success.
+
+# 0.2.1
+
+📜 Docs updates.
+
+# 0.2.0
+
+🐛 Fix a panic when creating email forwards. A vital component!
+
+# 0.1.2
+
+📜 Terraform Registry docs updates: all possible params, etc.
+
+# 0.1.1
+
+📜 Add docs to be displayed on the Terraform Registry with some example Terraform configuration.
+
+# 0.1.0
+
+🚀 Create/Read/Update/Delete/Import ImprovMX domains.
+🚀 Create/Read/Update/Delete/Import ImprovMX email forwards.