Update pg to version 5.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

pg just published its new version 5.0.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of pg – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 94 commits .

• 86bd9a1 Bump version
• f0e1622 Update changelog for 5.0
• 01e5d72 Support for defaults.connectionString (#910)
• 90600f2 Adding returnToHead in clientConfig param (#1007)
• 667953f Proper error message for undefined where options (#1022)
• edf4e7f add dependencies badge on readme (#1024)
• c1e52e7 added .npmignore in order to not publish tests to npm (#1025)
• ad2ffce pg.native returns null if pg-native is missing (#950)
• 06743a7 pgpass: Update to 0.0.6 (#1040)
• 13a82ad Update Copyright notice to 2016 (#1036)
• 6cc1b2c Bump version
• d7307b1 use latest generic-pool (#1031)
• 55abbaa don't mutate params when preparing statement (#992)
• 5d3b506 Change test matrix in .travis.yml (#1002)
• 4047dd1 Bump version

There are 94 commits in total. See the full diff.

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