Release ink! 3.0.0

[cmichi]

Preview here.

Do not merge!

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 0.18.0-9362c04 and comparing them to ink! master:

	Δ Optimized Size	Δ Used Gas	Total Optimized Size	Total Used Gas
accumulator			1.03 K
adder			2.17 K
contract-introspection			2.37 K
contract-terminate			0.94 K	214_418
contract-transfer			8.15 K	14_418
delegator			6.37 K	46_295
dns			8.84 K	43_254
erc1155			17.23 K	86_508
erc20			8.49 K	43_254
erc721			11.81 K	115_344
flipper			1.31 K	14_418
incrementer			1.21 K	14_418
multisig			25.20 K	93_527
proxy			2.90 K	29_536
rand-extension			3.92 K	14_418
subber			2.19 K
trait-erc20			8.76 K	43_254
trait-flipper			1.00 K	14_418
trait-incrementer			1.19 K	28_836
upgradeable-contract			2.99 K	14_950
upgradeable-flipper			1.55 K

Link to the run | Last update: Wed Mar 16 21:28:26 CET 2022

[codecov-commenter]

Codecov Report

Merging #1160 (ec6687d) into master (a35e159) will decrease coverage by 17.27%.
The diff coverage is n/a.

❗ Current head ec6687d differs from pull request most recent head 0e8e01a. Consider uploading reports for the commit 0e8e01a to get more accurate results

@@             Coverage Diff             @@
##           master    #1160       +/-   ##
===========================================
- Coverage   78.98%   61.71%   -17.28%     
===========================================
  Files         229      228        -1     
  Lines        8667     8637       -30     
===========================================
- Hits         6846     5330     -1516     
- Misses       1821     3307     +1486     

Impacted Files	Coverage Δ
crates/lang/codegen/src/traits.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/ir/src/ir/contract.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/env.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/mod.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/enforced_error.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/blake2b.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/storage.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/arg_list.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/contract.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/selector.rs	0.00% <0.00%> (-100.00%)	⬇️
... and 50 more

---

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[xgreenx]

I think we need to merge also that #1169 and it is ready=)

[ascjones]

🎉

[HCastano]