fix(deps): update dependency pg to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pg	dependencies	major	^7.5.0 -> ^8.0.0

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Release Notes

brianc/node-postgres

v8.0.2

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v8.0.1

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v8.0.0

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note: for detailed release notes please check here

• Remove versions of node older than 6 lts from the test matrix. pg>=8.0 may still work on older versions but it is no longer officially supported.
• Change default behavior when not specifying rejectUnauthorized with the SSL connection parameters. Previously we defaulted to rejectUnauthorized: false when it was not specifically included. We now default to rejectUnauthorized: true. Manually specify { ssl: { rejectUnauthorized: false } } for old behavior.
• Change default database when not specified to use the user config option if available. Previously process.env.USER was used.
• Change pg.Pool and pg.Query to be an es6 class.
• Make pg.native non enumerable.
• notice messages are no longer instances of Error.
• Passwords no longer show up when instances of clients or pools are logged.

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[coveralls]

Pull Request Test Coverage Report for Build 945

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.684%

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Totals
Change from base Build 901:	0.0%
Covered Lines:	135
Relevant Lines:	136

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💛 - Coveralls