0.6
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* Fixed the `dfs` `enterVertex` and `exitVertex` order, they were wrong before.
* Factored out a common visitor model for both `bfs` and `dfs`.

0.5
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* Added `enterEdge` to `bfs` and `dfs`.
* Exported `AdjacencyListGraph` and `AdjacencyMatrixGraph`.

0.4.1
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* Added CHANGELOG
* Removed my intra-package dependency upper bounds