Release v1.5.0

- Staking contract upgrade (GIP-10) (GIP-11) (GIP-12)
- DisputeManager contract upgrade (GIP-7)

Add extra docstrings to the AllocationExchange

Add extra input validations to the AllocationExchange

Support multiple voucher signers

Release v1.4.0

Typechain v5

Release v1.3.0

RewardsManager contract upgrade (GIP-3)
Fixes an edge case that prevents to calculate indexing rewards when the signal in a subgraph gets back to zero while there are open allocations.

Audited branch for graphprotocol#459

Audited branch for graphprotocol#458

Audited branch for graphprotocol#457

Audited branch for graphprotocol#430