message: Prepare for version 0.8
diff: Changelog
  =========
  +- 0.8.0
  + - accelerate sparse matrix product, remove the old implementation
  + **breaking change**
  + - introduce fill-in reduction permutation using reverse Cuthil-McKee
  + - fix permuted iteration that caused bugs in ``sprs-ldl``
  + **breaking change**
  + - check permutation validity on creation **breaking change**
  - 0.7.1
  - fix issue when building docs on nightly, which broke on docs.sprs
  - 0.7.0
  