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travis-pro

Update solver version to v0.8.1 (#1110)

Solver PRs included:
* forbid self-trades via combinatorial constraints (https://github.com/gnosis/dex-solver/pull/306)
* alternative MIP-based ring-finder for best-ring solver (only added, not used currently)
* code cleanup

### Test Plan
e2e tests

10190 of 41695 branches covered (24.44%)

Branch coverage included in aggregate %.

2673 of 4379 relevant lines covered (61.04%)

13669.21 hits per line