Pradyun / TP (29 April 2020)

Agenda: Discussion about https://github.com/sarugaku/resolvelib/issues/46

- Looked at the draft graphic from the previous dev syncup
	* Discussed what this request is for -- specifically, that it is for identifying a candidate -> requirement edge
- Looked at the code
	* Discussed various options for implementing the required hooks
			* Adding a `evaluating` hook
			* Augmenting the `pinning` hook
			* Augumenting the `adding_requirement` hook
	* Settled on changing the `adding_requirement` hook

TODO:
	* Pradyun to file a PR to resolvelib, adding the hook.
	* TP to update documentation for the hook and merge.