Drop node v6

• fix: drop node v6 f6536c6
• chore(deps): upgrade b28324b
• chore(github): add CODE_OF_CONDUCT acbe9b2
• Add yarn & Update deps c97ab6c
• Merge pull request #11 from akameco/greenkeeper-ava-0.18.0 51e3582
• chore(package): update ava to version 0.18.0 49395d5
• Merge pull request #10 from akameco/greenkeeper-ava-0.17.0 5a513dc
• chore(package): update ava to version 0.17.0 f17e2e9
• Fix lint error 53fce58
• Update deps 0978627
• Merge pull request #8 from akameco/greenkeeper-ava-0.16.0 bb31d4c
• chore(package): update ava to version 0.16.0 26ee323
• Merge pull request #6 from akameco/greenkeeper-ava-0.15.1 03f985a
• chore(package): update ava to version 0.15.1 4f28a4d
• Merge pull request #4 from akameco/greenkeeper-path-exists-3.0.0 22b6166
• chore(package): update path-exists to version 3.0.0 7351f98
• Update dependencies dc37491
• Update readme.md 5f1e97e
• Merge pull request #2 from akameco/greenkeeper-ava-0.14.0 f05d051
• chore(package): update ava to version 0.14.0 d0b5ee4

v0.3.1...v1.0.0