Semi-major version bump due to changing previous deploy method and some methods/vars on the API.

Changelog:

• Implement partial slashing
• Remove contract constructor in favor of an explicit one-time method -- init
• add warm_up_period to stall contract functionality after deploy for warm_up_period blocks to allow time for initial validators to make deposits
• add public method slashable(vote_msg_1, vote_msg_2) to expose slashable logic to clients
• SIGHASHER to MSG_HASHER. Change all vars from sighash to msg_hash
• validate contract params passed into init
• increase test coverage
• Add resources to README

v0.2.0 contract abi
v0.2.0 runtime bytecode

v0.1.0 marks us more clearly tagging releases to help clients and external auditors more easily track the contract and changes.

Recent Changes:

• rename votes to checkpoints
• rename total_*dyn_deposits_scaled() to total_*dyn_deposits_in_wei()
• add vars VALIDATION_GAS_LIMIT and SIGHASHER_GAS_LIMIT
• reduce VALIDATION_GAS_LIMIT to 200k
• remove owner backdoor
• add fork choice helpers
  • memoize size of deposits at each checkpoint in the checkpoints struct
  • add START_EPOCH
  • add highest_justified_epoch(min_deposits)
  • add highest_finalized_epoch(min_deposits)

v0.1.0 contract abi