Release Version 3.0.1

[HCastano]

Follow up to #1189.

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 1.1.0-85b65c6 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
delegate-calls			2.99 K	14_950
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
forward-calls			2.90 K	29_536
incrementer			1.21 K	14_418
multisig			25.20 K	93_527
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-flipper			1.55 K

Link to the run | Last update: Mon Apr 4 19:06:33 CEST 2022

[codecov-commenter]

Codecov Report

Merging #1190 (d0064b4) into master (6f105c2) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1190      +/-   ##
==========================================
- Coverage   79.03%   78.92%   -0.12%     
==========================================
  Files         229      229              
  Lines        8667     8667              
==========================================
- Hits         6850     6840      -10     
- Misses       1817     1827      +10     

Impacted Files	Coverage Δ
crates/storage/src/collections/vec/fuzz_tests.rs	85.71% <0.00%> (-14.29%)	⬇️
crates/metadata/src/layout/mod.rs	75.86% <0.00%> (-1.15%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6f105c2...d0064b4. Read the comment docs.

[cmichi]

As a follow-up to #1200 you should bump the versions of all crates and update the RELEASES.md as part of this PR. You can also be the first one to try out the checklist by releasing 3.0.1.

[HCastano]

As a follow-up to #1200 you should bump the versions of all crates and update the RELEASES.md as part of this PR. You can also be the first one to try out the checklist by releasing 3.0.1.

Will try the new release checklist tomorrow 😃

[cmichi]

Don't forget to bump the version in all crates + examples.