minor changes / fixes to release 0.31.0 (#3422)

* bump ABCIVersion due to renaming BlockSizeParams -> BlockParams
(https://github.com/tendermint/tendermint/pull/3417#discussion_r264974791)

* Move changelog on consensus params entry to breaking

* Add @melekes' suggestion for breaking change in pubsub into upgrading.md

* Add changelog entry for #3351

* Add changelog entry for #3358 & #3359

* Add changelog entry for #3397

* remove changelog entry for #3397 (was already released in 0.30.2)

* move 3351 to improvements

* Update changelog comment

CHANGELOG.md

@@ -14,10 +14,13 @@ Special thanks to external contributors on this release:
 
 * Apps
 
+- [genesis] [\#2920](https://github.com/tendermint/tendermint/issues/2920) Rename `consensus_params.block_size` to `consensus_params.block` in ABCI ConsensusParams
+
 * Go API
 - [libs/common] TrapSignal accepts logger as a first parameter and does not block anymore
   * previously it was dumping "captured ..." msg to os.Stdout
   * TrapSignal should not be responsible for blocking thread of execution
+- [libs/db] [\#3397](https://github.com/tendermint/tendermint/pull/3397) Add possibility to `Close()` `Batch` to prevent memory leak when using ClevelDB. (@Stumble)   
 
 * Blockchain Protocol
 
@@ -29,7 +32,6 @@ Special thanks to external contributors on this release:
   `/num_unconfirmed_txs` and `/unconfirmed_txs` RPC endpoints.
 - [config] [\#2920](https://github.com/tendermint/tendermint/issues/2920) Remove `consensus.blocktime_iota` parameter
 - [genesis] [\#2920](https://github.com/tendermint/tendermint/issues/2920) Add `time_iota_ms` to block's consensus parameters (not exposed to the application)
-- [genesis] [\#2920](https://github.com/tendermint/tendermint/issues/2920) Rename `consensus_params.block_size` to `consensus_params.block`
 - [lite] add `/unsubscribe_all` endpoint, which allows you to unsubscribe from all events
 
 ### IMPROVEMENTS:
@@ -43,12 +45,15 @@ Special thanks to external contributors on this release:
   - leveldb.openedtables
   - leveldb.alivesnaps
   - leveldb.aliveiters
+- [privval] [\#3351](https://github.com/tendermint/tendermint/pull/3351) First part of larger refactoring that clarifies and separates concerns in the privval package.
 
 ### BUG FIXES:
 - [p2p/conn] [\#3347](https://github.com/tendermint/tendermint/issues/3347) Reject all-zero shared secrets in the Diffie-Hellman step of secret-connection
 - [libs/pubsub] [\#951](https://github.com/tendermint/tendermint/issues/951), [\#1880](https://github.com/tendermint/tendermint/issues/1880) use non-blocking send when dispatching messages [ADR-33](https://github.com/tendermint/tendermint/blob/develop/docs/architecture/adr-033-pubsub.md)
 - [p2p] [\#3369](https://github.com/tendermint/tendermint/issues/3369) do not panic when filter times out
 - [cmd] [\#3408](https://github.com/tendermint/tendermint/issues/3408) Fix `testnet` command's panic when creating non-validator configs (using `--n` flag) (@srmo)
+- [blockchain] [\#3358](https://github.com/tendermint/tendermint/pull/3358) Fix timer leak in `BlockPool` (@guagualvcha)
+- [p2p] [\#3359](https://github.com/tendermint/tendermint/pull/3359) Fix reconnecting report duplicate ID error due to race condition between adding peer to peerSet and starting it (@guagualvcha)
 
 ## v0.30.2
 

UPGRADING.md

@@ -3,6 +3,24 @@
 This guide provides steps to be followed when you upgrade your applications to
 a newer version of Tendermint Core.
 
+## v0.31.0
+
+Since the pubsub no longer blocks on sending, some WS clients might stop working as expected. 
+If your WS client is not consuming events fast enough, Tendermint can terminate the subscription. 
+In this case, the WS client will receive an error with description:
+
+```json
+{
+  "jsonrpc": "2.0",
+  "id": "{ID}#event",
+  "error": {
+    "code": -32000,
+    "msg": "Server error",
+    "data": "subscription was cancelled (reason: client is not pulling messages fast enough)" // or "subscription was cancelled (reason: Tendermint exited)"
+  }
+}
+```
+
 ## v0.30.0
 
 This release contains a breaking change to both the block and p2p protocols,

version/version.go

@@ -23,7 +23,7 @@ const (
 	TMCoreSemVer = "0.31.0"
 
 	// ABCISemVer is the semantic version of the ABCI library
-	ABCISemVer  = "0.15.0"
+	ABCISemVer  = "0.16.0"
 	ABCIVersion = ABCISemVer
 )