WIP: Add ability to modify matched router parameters in middleware#1373

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ahopkins wants to merge 3 commits intosanic-org:masterfrom ahopkins:master

+78-16

Commits on Oct 19, 2018

Add ability to modify matched router parameters in middleware with documentation and test
ahopkins
committed
Add black to requirements-dev.txt
ahopkins
committed

Commits on Oct 26, 2018

Make changes to docs for building
ahopkins
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