Pending

BREAKING CHANGES:

[types] Header ...
[state] Add NextValidatorSet, changes on-disk representation of state
[state] Validator set changes are delayed by one block (!)
[lite] Complete refactor of the package
[rpc] /commit returns a signed_header field instead of everything being top-level
[abci] Added address of the original proposer of the block to Header.
[abci] Change ABCI Header to match Tendermint exactly
[libs] Remove cmn.Fmt, in favor of fmt.Sprintf
[blockchain] fix go-amino routes for blockchain messages
[crypto] Rename AminoRoute variables to no longer be prefixed by signature type.
[config] Replace MaxNumPeers with MaxNumInboundPeers and MaxNumOutboundPeers
[node] NewNode now accepts a *p2p.NodeKey
[crypto] Secp256k1 signature format changed from DER to r || s, both little endian encoded as 32 bytes.
[crypto] Secp256k1 signature malleability removed by requiring s to be in canonical form. (See ADR 14)
[abci] #2159 Update use of Validator ala ADR-018:
- Remove PubKey from Validator and introduce ValidatorUpdate
- InitChain and EndBlock use ValidatorUpdate
- Update field names and types in BeginBlock
[p2p] update secret connection to use a little endian encoded nonce

FEATURES:

[types] allow genesis file to have 0 validators (#2015)
[libs] allow passing options through when creating instances of leveldb dbs (#2292)

IMPROVEMENTS:

[docs] Lint documentation with write-good and stop-words.
[scripts] Added json2wal tool, which is supposed to help our users restore corrupted WAL files and compose test WAL files (@bradyjoestar)
[mempool] Now stores txs by hash inside of the cache, to mitigate memory leakage
[config] Replace db_path with db_dir from automatically generated configuration files. Issue reported to Cosmos SDK (#1712)
[config] Reduce default mempool size from 100k to 5k, until ABCI rechecking is implemented.

BUG FIXES:

[mempool] No longer possible to fill up linked list without getting caching benefits #2180