Enhancements
- [44](https://github.com/korpling/graphANNIS/issues/44) Add support for the `_l_` and `_r_` alignment AQL operators
- [43](https://github.com/korpling/graphANNIS/issues/43) Automatic creation of left- and right-most token edges
- [42](https://github.com/korpling/graphANNIS/issues/42) Remove inverse coverage and inverse left-/right-most token edges
- [41](https://github.com/korpling/graphANNIS/issues/41) Add value negation
- [38](https://github.com/korpling/graphANNIS/issues/38) Add an mdBook based documentation