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

Release v1.2.0

Staking contract upgrade (GIP-2)

Update NPM package to 1.1.0

Release v1.0.1

Release v1.0.0

Release v0.8.1-testnet-phase2.2

- Update GRTAssetHolder address