Release 0.5.0

[DavidMinarsch]

Release summary

Version number: v0.5.0

Release details

This release brings:

• Refactors all connections to be fully async friendly
• Adds almost complete test coverage on connections
• Adds complete test coverage for cli and cli gui
• Fixes cli gui functionality and removes oef node dependency
• Refactors p2p go code and increases test coverage
• Refactors protocol generator for higher code reusability
• Adds option for skills to depend on other skills
• Adds abstract skills option
• Adds ledger connections to execute ledger related queries and transactions, removes ledger apis from skill context
• Adds contracts registry and removes them from skill context
• Rewrites all skills to be fully message based
• Replaces internal messages with protocols (signing and state update)
• Multiple refactoring to improve pylint adherence
• Multiple docs updates
• Multiple test stability fixes

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the master branch (left side), from develop
• Lint and unit tests pass locally
• I have checked the fingerprint hashes are correct by running (scripts/generate_ipfs_hashes.py)
• I have regenerated the latest API docs
• I built the documentation and updated it with the latest changes
• I have added an item in HISTORY.md for this release
• I bumped the version number in the aea/__version__.py file.
• I bumped the version number in the docs/version.md file
• I bumped the version number in every Docker image of the repo and published it. Also, I built and published them with tag latest
  (check the READMEs of aea-develop
  and aea-deploy)
• I have checked that the documentation about the aea cli tool works
• I have pushed the latest packages to the registry.

Further comments

[codecov-commenter]

Codecov Report

Merging #1461 into master will decrease coverage by 0.92%.
The diff coverage is 84.84%.

@@            Coverage Diff             @@
##           master    #1461      +/-   ##
==========================================
- Coverage   90.49%   89.57%   -0.93%     
==========================================
  Files         206      242      +36     
  Lines       14945    17183    +2238     
==========================================
+ Hits        13525    15391    +1866     
- Misses       1420     1792     +372     

Flag	Coverage Δ
#unittests	89.57% <84.84%> (-0.93%)	⬇️

Impacted Files	Coverage Δ
aea/connections/base.py	100.00% <ø> (+5.10%)	⬆️
aea/connections/scaffold/connection.py	100.00% <ø> (+6.66%)	⬆️
aea/helpers/search/generic.py	100.00% <ø> (ø)
aea/helpers/win32.py	100.00% <ø> (+9.09%)	⬆️
packages/fetchai/connections/gym/connection.py	95.74% <ø> (+0.04%)	⬆️
...ages/fetchai/connections/http_client/connection.py	100.00% <ø> (+13.75%)	⬆️
...ages/fetchai/connections/http_server/connection.py	100.00% <ø> (+6.03%)	⬆️
packages/fetchai/connections/ledger/__init__.py	100.00% <ø> (ø)
packages/fetchai/connections/ledger/base.py	94.91% <ø> (ø)
packages/fetchai/connections/ledger/connection.py	90.54% <ø> (ø)
... and 178 more

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[marcofavorito]

LGTM