Sourced from deep-extend's changelog.

v0.6.0

• Updated "devDependencies" versions to fix vulnerability alerts
• Dropped support of io.js and node.js v0.12.x and lower since new versions of "devDependencies" couldn't work with those old node.js versions (minimal supported version of node.js now is v4.0.0)

v0.5.1

• Fix prototype pollution vulnerability (thanks to @​mwakerman for the PR)
• Avoid using deprecated Buffer API (thanks to @​ChALkeR for the PR)

v0.5.0

• Auto-testing provided by Travis CI;
• Support older Node.JS versions (v0.11.x and v0.10.x);
• Removed tests files from npm package.

• f3f2b4f more versions of node.js to test by travis-ci
• 3d85253 package.json: updated "engines"
• 8b8aef9 dropped support of old node.js versions
• 120fd97 increased "devDependencies" (mocha) up enough to fix vulnerability
• 235821a decreasing versions of "devDependencies" to fix tests for older node versions
• a1eb0eb README: removed "download" stats badge
• 7bebe75 CHANGELOG: info for 0.5.2 version
• 16b328f 0.5.2
• 0402225 updated "devDependencies" to fix vulnerability alerts
• 2e0110e prepared v0.5.1 release
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