Bump Substrate (#816)

* Amalgamate pieces of balance module

* Fixes for vesting split

* Refactoring for vesting/balances split

* Build fixes

* Remove on_free_balance_zero and some docs.

* Indentation.

* Revert branch

* Fix.

* Update substrate: fixes after CLI refactoring

* Reverting removal of exit

* Removed too much again

* Update Cargo.lock

* Cargo.lock

* Update Substrate, ready for #4820

* Fixes

* Update to latest substrate master

* Fix network tests

* Update lock

* Fix tests

* Update futures to get bug fixes

* Fix tests for new balances/vesting logic

* Cargo fix

* Another fix

Co-authored-by: Cecile Tonglet <cecile.tonglet@cecton.com>
Co-authored-by: Robert Habermeier <rphmeier@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

polkadot/availability-store/Cargo.toml

@@ -11,7 +11,7 @@ polkadot-erasure-coding = { path = "../erasure-coding" }
 parking_lot = "0.9.0"
 derive_more = "0.99"
 log = "0.4.8"
-futures = "0.3.1"
+futures = "0.3.4"
 tokio = { version = "0.2.10", features = ["rt-core"] }
 exit-future = "0.2.0"
 codec = { package = "parity-scale-codec", version = "1.1.0", features = ["derive"] }