CHANGELOG: simplify top-level CHANGELOG

# Introduction

This page describes various changes to the ASN.1 and XSD schema

provided with 3GPP TS 33.128.

This page provides links to per-specification CHANGELOGs

for the schemas in the 3GPP SA3-LI Repository.

Conventions used within the Change description are:

| Term          | Purpose |

| ----          | ------ |

| *Breaking*    | Breaking change to the schema. |

| *Fix*         | Fix to the schema to permit compilation. |

| *Note*        | Inconsisent versioning, or potential issue in repository such as missing git tag. |

| *Warning*     | Compatibility issue with a different Release or Version. |

* [3GPP TS 33.128 Release 15](33128/r15/CHANGELOG.md)

* [3GPP TS 33.128 Release 16](33128/r16/CHANGELOG.md).

* [3GPP TS 33.128 Release 17](33128/r17/CHANGELOG.md).

* [3GPP TS 33.128 Release 18](33128/r18/CHANGELOG.md).

* [3GPP TS 33.128 Release 19](33128/r19/CHANGELOG.md).

# Table of Contents

[[_TOC_]]

# Release 15

Changes to 3GPP TS 33.128 Release 15 are described in [33128/r15/CHANGELOG.md](33128/r15/CHANGELOG.md).

# Release 16

Changes to 3GPP TS 33.128 Release 16 are described in [33128/r16/CHANGELOG.md](33128/r16/CHANGELOG.md).

# Release 17

Changes to 3GPP TS 33.128 Release 17 are described in [33128/r17/CHANGELOG.md](33128/r17/CHANGELOG.md).

# Release 18

Changes to 3GPP TS 33.128 Release 18 are described in [33128/r18/CHANGELOG.md](33128/r18/CHANGELOG.md).

# Release 19

Changes to 3GPP TS 33.128 Release 19 are described in [33128/r19/CHANGELOG.md](33128/r19/CHANGELOG.md).

Note: not all specifications have a CHANGELOG yet.