Release v0.7 (#818)

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## Next version
## 2021-01-19 v0.7
This release contains the following:
Release highlights:
- Support for secure websockets.
- Ability to remove unreachable clients in a `filter` node.
- Several fixes to improve `store` performance and decrease query times. Query time for large stores decreased from longer than 8 min to under 100 ms.
- Fix for a long-standing bug that prevented proper database migration in some deployed Docker containers.
The full list of changes is below.
### Features
- Waku v2 node timeout for Filter nodes.
- Waku v2 node support for secure websockets.
- Support for secure websocket transport
### Changes
- The WakuInfo Object field of `listenStr` is deprecated and is now replaced with `listenAddresses`
which is a sequence of string.
- Removed cached `peerInfo` on local node. Rely on underlying libp2p switch instead.
- Filter nodes can now remove unreachable clients
- The WakuInfo `listenStr` is deprecated and replaced with a sequence of `listenAddresses` to accommodate multiple transports
- Removed cached `peerInfo` on local node. Rely on underlying libp2p switch instead
- Metrics: added counters for protocol messages
- Waku v2 node discovery now supports [`31/WAKU2-ENR`](https://rfc.vac.dev/spec/31/)
### Fixes
- Fixed database migration failure in the Docker image
- All `HistoryResponse` messages are now auto-paginated to a maximum of 100 messages per response
- Increased maximum length for reading from a libp2p input stream to allow largest possible protocol messages, including `HistoryResponse` messages at max size.
- Significantly improved store node query performance
- Added GossipSub `MessageIdProvider` for `11/WAKU2-RELAY` messages.
- Store: timestamps of message reception, used for indexing, now have consistent millisecond resolution.
- Increased maximum length for reading from a libp2p input stream to allow largest possible protocol messages, including `HistoryResponse` messages at max size
- Significantly improved `store` node query performance
- Implemented a GossipSub `MessageIdProvider` for `11/WAKU2-RELAY` messages instead of relying on the unstable default
- Receiver timestamps for message indexing in the `store` now have consistent millisecond resolution
This release supports the following [libp2p protocols](https://docs.libp2p.io/concepts/protocols/):
| Protocol | Spec status | Protocol id |
| ---: | :---: | :--- |
| [`17/WAKU-RLN-RELAY`](https://rfc.vac.dev/spec/17/) | `raw` | `/vac/waku/waku-rln-relay/2.0.0-alpha1` |
| [`11/WAKU2-RELAY`](https://rfc.vac.dev/spec/11/) | `stable` | `/vac/waku/relay/2.0.0` |
| [`12/WAKU2-FILTER`](https://rfc.vac.dev/spec/12/) | `draft` | `/vac/waku/filter/2.0.0-beta1` |
| [`13/WAKU2-STORE`](https://rfc.vac.dev/spec/13/) | `draft` | `/vac/waku/store/2.0.0-beta3` |
| [`18/WAKU2-SWAP`](https://rfc.vac.dev/spec/18/) | `draft` | `/vac/waku/swap/2.0.0-beta1` |
| [`19/WAKU2-LIGHTPUSH`](https://rfc.vac.dev/spec/19/) | `draft` | `/vac/waku/lightpush/2.0.0-beta1` |
The Waku v1 implementation is stable but not under active development.
## 2021-11-05 v0.6