Add Client.update_middleware/2 function #523
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I have seen this being a pain point a few times so maybe it's useful for someone else.
A typical use-case is the following:
A third-party library (i.e GitHub) exposes a function that returns a Tesla client, but I want to append a header or add logging/telemetry to it. Currently I need to write a wrapper for Tesla.Client.middleware/1 and Tesla.client/2, this merges the two into a single function.