Fix/readme links (#2368)

* Updated broken README.md links

* Updated CHANGES

Author: graeme44

CHANGES

@@ -1,3 +1,4 @@
+    * Update README.md links
     * Fix timezone handling for datetime to unixtime conversions
     * Fix start_id type for XAUTOCLAIM
     * Remove verbose logging from cluster.py

README.md

@@ -9,7 +9,7 @@ The Python interface to the Redis key-value store.
 [![codecov](https://codecov.io/gh/redis/redis-py/branch/master/graph/badge.svg?token=yenl5fzxxr)](https://codecov.io/gh/redis/redis-py)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/redis/redis-py.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/redis/redis-py/alerts/)
 
-[Installation](#installation) | [Contributing](#contributing) |  [Getting Started](#getting-started) | [Connecting To Redis](#connecting-to-redis) | [Contributing](https://github.com/redis/redis-py/blob/master/CONTRIBUTING.md)
+[Installation](#installation) |  [Usage](#usage) | [Advanced Topics](#advanced-topics) | [Contributing](https://github.com/redis/redis-py/blob/master/CONTRIBUTING.md)
 
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