This is proposed language for the upgrade process about the new custom
reactor/mempool support.

## Description

Remove v2 flag from toml

## Description

Mark gRPC as deprecated in the RPC layer. 

closes #6718

Addresses a beginning component of #6255

Co-authored-by: dongsam <dongsamb@gmail.com>
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

Migrate ABCI to use protoio (uint64 length delimitation) instead of specific int64 length delimiters.

Closes: #5783

closes: #5770
closes: #5769

also, include node ID in the output (#5769) and modify NodeKey to use
value semantics (it makes perfect sense for NodeKey to not be a
pointer).

## Description

add back removed changelog entry

Closes: #XXX

## Description

- add `AbciVersion` RequestInfo

Closes: #2804

Co-authored-by: Marko <marbar3778@yahoo.com>

Secp256k1 was removed in the protobuf migration, this pr adds it back in order to provide this functionality for users (band)

Closes: #5495

Remove Response/Request SetOption from ABCI.

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

* docs: fix /validators description

Refs https://github.com/tendermint/spec/pull/169

* consensus: remove nil err from logging statement

* update UPGRADING.md

* note about LightBlocks

This change adds some polish to the upgrading instructions for 0.34. The only substantive changes include:
* Calling out ABCI-impacting changes explicitly in the "ABCI Changes" section, even if those changes are also mentioned elsewhere
* Removes `ProofOfTrialPeriod` from consensus params; this change was introduced and then removed.

## Description

Adding a section explaining the state store interface change. I wasn't aware this was used externally. Our infamous API strikes again.


<img width="462" alt="Screen Shot 2020-09-16 at 2 57 12 PM" src="https://user-images.githubusercontent.com/24299864/93342053-2835fe80-f82f-11ea-9296-9484c2931d9a.png">

Closes: #XXX

* config: rename prof_laddr to pprof_laddr and move it to rpc

also, remove `/unsafe_start_cpu_profiler`, `/unsafe_stop_cpu_profiler`
and `/unsafe_write_heap_profile` in favor of pprof server functionality.

Closes #5303

* update changelog

* log start

## Description

Add block pruning information to `upgrading.md`
Closes: #XXX

## Description

Remove secp256k1 as discussed in the tendermint dev call. The implementation has been moved to the [Cosmos-SDK](443e0c1f89/crypto/keys/secp256k1)

Closes: #XXX

## Description

Add chainid to requests to privval. This is a non-breaking change and hardware devices can opt to ignore the field.
 
Closes: #4503 

Took the approach of passing chainID to the client instead of modifying `GetPubKey` because it would lead to a larger change throughout the codebase and in some places it could get tricky to get chainID.

Followup from #5227. Instead of checking `ResponseInitChain.app_hash` against the genesis doc app hash, we instead replace it. We should probably remove the genesis doc app hash completely, and rely solely on the one from `InitChain`, I'll open a separate issue to discuss this.

Adds a genesis parameter `initial_height` which specifies the initial block height, as well as ABCI `RequestInitChain.InitialHeight` to pass it to the ABCI application, and `State.InitialHeight` to keep track of the initial height throughout the code. Fixes #2543, based on [RFC-002](https://github.com/tendermint/spec/pull/119). Spec changes in https://github.com/tendermint/spec/pull/135.

Fixes #5177.

Fixes #5192.

@liamsi Can you verify that the test vectors match the Rust implementation? I updated `ProofsFromByteSlices()` as well, anything else that should be updated?

[**RENDERED**](9a7b139a72/CHANGELOG_PENDING.md (v0336))

Closes #5057

## Description

- expand `upgrading.md`
- alphabetize the changelog
- update swagger with changes


Closes: #XXX

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

Closes #4411

Refs #1007

## Description

deprecation & removal of multisig. This key was only used in the sdk and now it has been added there

Closes: #4715 
Closes: #2163

## Description

In https://github.com/tendermint/tendermint/pull/4466 a new type was created (EventAttribute) that replaced KV.Pair. This made the type Pair deadcode, this pr removes that type.

I don't think a changelog entry is needed since it is not being used anymore. But will add a section to the upgrading.md to let users know that it was replaced

Closes: #XXX

Prepare release 0.33.4

* upgrading: add note on rpc/client subpackages

* clarify constructors

- erik fixed many of the broken links, just fixed two outstanding ones.

- closes #4381

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>