Release ink! 3.1.0

[cmichi]

Release notes preview here.

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 1.3.0-824c2f6 and comparing them to ink! master:

	Δ Optimized Size	Δ Used Gas	Total Optimized Size	Total Used Gas
accumulator			1.04 K
adder			2.13 K
contract-introspection			2.37 K
contract-terminate			0.94 K	275_000
contract-transfer			8.13 K	75_000
data-structures			1.73 K
delegate-calls			2.96 K	76_276
delegator			6.38 K	232_281
dns			8.84 K	225_000
erc1155			17.34 K	450_000
erc20			8.49 K	225_000
erc721			11.81 K	600_000
flipper			1.31 K	75_000
forward-calls			2.88 K	151_427
incrementer			1.21 K
multisig			25.15 K	470_178
rand-extension			3.92 K	75_000
seal-code-hash			1.58 K
set-code-hash			1.57 K	150_000
subber			2.15 K
trait-erc20			8.77 K	225_000
trait-flipper			1.00 K	75_000
trait-incrementer			1.19 K	150_000
updated-incrementer			9.62 K
upgradeable-flipper			1.55 K

Link to the run | Last update: Fri May 13 13:14:06 CEST 2022

[codecov-commenter]

Codecov Report

Merging #1240 (6bfe6f2) into master (2051044) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 6bfe6f2 differs from pull request most recent head fbb35c9. Consider uploading reports for the commit fbb35c9 to get more accurate results

@@           Coverage Diff           @@
##           master    #1240   +/-   ##
=======================================
  Coverage   78.80%   78.80%           
=======================================
  Files         229      228    -1     
  Lines        8684     8668   -16     
=======================================
- Hits         6843     6831   -12     
+ Misses       1841     1837    -4     

Impacted Files	Coverage Δ
crates/env/src/backend.rs	83.33% <ø> (ø)
crates/lang/src/env_access.rs	12.00% <ø> (ø)
crates/env/src/api.rs	33.80% <100.00%> (+2.92%)	⬆️
crates/env/src/engine/off_chain/impls.rs	44.70% <100.00%> (+2.73%)	⬆️
...ates/storage/src/collections/hashmap/fuzz_tests.rs	95.74% <0.00%> (-4.26%)	⬇️
crates/lang/ir/src/ir/attrs.rs	82.27% <0.00%> (+0.27%)	⬆️

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