Bump composer/composer from 1.8.3 to 1.8.4

[dependabot-preview]

Bumps composer/composer from 1.8.3 to 1.8.4.

Release notes

Sourced from composer/composer's releases.

1.8.4

• Fixed long standing solver bug leading to odd solving issues in edge cases, see #7946
• Fixed HHVM support for upcoming releases
• Fixed unix proxy for binaries to be POSIX compatible instead of breaking some shells
• Fixed invalid deprecation warning for composer-plugin-api
• Fixed edge case issues with Windows junctions when working with path repositories

Changelog

Sourced from composer/composer's changelog.

[1.8.4] 2019-02-11

• Fixed long standing solver bug leading to odd solving issues in edge cases, see #7946
• Fixed HHVM support for upcoming releases
• Fixed unix proxy for binaries to be POSIX compatible instead of breaking some shells
• Fixed invalid deprecation warning for composer-plugin-api
• Fixed edge case issues with Windows junctions when working with path repositories

Commits

• bc364c2 Release 1.8.4
• a5cd912 Update changelog
• 5ce6ae3 Merge pull request #7941 from johnstevenson/junctions
• 29ff6a4 Follow up to #7946 test: add solver flag to assert path execution
• da0dc74 Update doc block, remove redundant clearstatcache
• c66bb0b Fix tests
• 94df554 Make sure config command output is also output on --quiet so that warnings ca...
• e1ac0c7 Recognize composer-plugin-api as a platform package, fixes #7951
• 4de1f02 Quote wildcards to avoid issues in some shells, fixes #7960
• 408df4b Avoid dumping null values for dist reference/shasum and source reference, fix...
• Additional commits viewable in compare view

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