Pycares

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- doc: uppdate README
- core: add support for CAA queries
- core: add support for getaddrinfo()
- doc: update README
- core: add ability to use the system installed c-ares
- misc: set version to 4.0.0
- test: remove TTL tests
- core: update c-ares and use a submodule
- core: drop bundled c-ares version
- misc: drop tasks.py

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- misc: add Python 3.9 classifier
- core: drop py3.5 from CI and documentation
- ci: run tests in Python 3.9
- ci: fix SDK path in appveyor
- ci: fix VS linker in appveyor
- ci: update python installer script in appveyor
- misc: add compiled windows dll to gitignore
- test: skip SOA non-ascii test due to changes in remote host
- test: fix broken chunked TXT test due to changes in remote host
- test: skip ANY test due to problems with mac
- ci: add action to release wheels to PyPi
- ci: drop AppVeyor
- ci: don't fail fast
- ci: stop testing on Travis
- test: add generic way to check for a CI
- test: relax check
- test: try to avoid spurious CI failures
- ci: test all platforms on GH actions
- ci: build wheels on GH Actions
- build: fix build error on macOS
- ci: explicitly set Python versions to build wheels for
- ci: update cibuildwheel
- ci: re-add IDNA test

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- ffi: new style callbacks

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- misc: add Python 3.8 classifier
- (origin/master, origin/HEAD) build: use Travis to build Python Wheels
- ci: use GH Actions to test on macOS
- ci: run tests in Python 3.8 too
- test: remove no longer valid test
- test: remove empty test
- errno: return str from errno.strerror
- core: fix crash when processing .onion queries
- test: fix test_query_txt_multiple_chunked
- doc: fix path of _version.py file
- core: fix support for ARES_OPT_LOOKUPS option
- build: add cygwin support
- core: fix struct in6_addr alignment
- misc: simplify non-ascii txt test example
- core: fix long TXT record with non-ascii bytes
- build: remove extra add_include_dir line on linux
- build: fix testing manylinux wheels

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(changes since version 2.x)
- core: drop C backend in favor of CFFI
- core: drop Python < 3.5 support
- core: use None instead of -1 for default values
- core: add support for ANY queries
- core: automagically encode query names with IDNA
- core: add support for ares_search

===============
- core: add support for ares_search