Bump rstar

[urschrei]

v0.8.0 was just released, containing perf improvements.

[frewsxcv]

error[E0277]: the trait bound `geo_types::Line<T>: rstar::Point` is not satisfied

   --> geo/src/algorithm/simplifyvw.rs:250:11

    |

250 |     tree: &mut RTree<Line<T>>,

    |           ^^^^^^^^^^^^^^^^^^^ the trait `rstar::Point` is not implemented for `geo_types::Line<T>`

    |

    = note: required because of the requirements on the impl of `rstar::RTreeObject` for `geo_types::Line<T>`

    = note: required by `rstar::RTree`

error[E0277]: the trait bound `geo_types::Line<T>: rstar::Point` is not satisfied

   --> geo/src/algorithm/simplifyvw.rs:395:11

    |

395 |     tree: &RTree<Line<T>>,

    |           ^^^^^^^^^^^^^^^ the trait `rstar::Point` is not implemented for `geo_types::Line<T>`

    |

    = note: required because of the requirements on the impl of `rstar::RTreeObject` for `geo_types::Line<T>`

    = note: required by `rstar::RTree`

error: aborting due to 2 previous errors

[urschrei]

ಠ_ಠ

[urschrei]

Bors r+

[bors]

Build succeeded:

• continuous-integration/travis-ci/push