v0.5.10

• Fix: Avoid unneeded warning when decoding invalid data on PHP 7.4.
  (#150 by @clue)

• Add .gitattributes to exclude dev files from exports.
  (#149 by @reedy)

• Link to clue/reactphp-buzz for higher-level HTTP client.
  (#139 by @clue)

• Improve test suite by simplifying test matrix and test setup.
  (#151 by @clue)