Tracking PR for dropping 3.6 support

[meadsteve]

Fixes #176

Now that 2.0.0 has released this branch can become active

[sourcery-ai[bot]]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 1.26%.

Quality metrics	Before	After	Change
Complexity	1.03 ⭐	0.66 ⭐	-0.37 👍
Method Length	23.45 ⭐	22.09 ⭐	-1.36 👍
Working memory	4.41 ⭐	4.21 ⭐	-0.20 👍
Quality	92.37% ⭐	93.63% ⭐	1.26% 👍

Other metrics	Before	After	Change
Lines	108	105	-3

Changed files	Quality Before	Quality After	Quality Change
lagom/exceptions.py	92.37% ⭐	93.63% ⭐	1.26% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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