chore(deps): update dependency db-migrate-pg to v0.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
db-migrate-pg	optionalDependencies	minor	0.4.0 -> 0.5.0	source

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Release Notes

db-migrate/pg

### [`v0.5.0`](https://togithub.com/db-migrate/pg/blob/master/CHANGELOG.md#​050httpsgithubcomdb-migratepgcomparev040v050-2019-02-11) [Compare Source](https://togithub.com/db-migrate/pg/compare/v0.4.0...v0.5.0) ##### Features - **defaultValue:** add advanced handling for defaultValues ([a13c0e0](https://togithub.com/db-migrate/pg/commit/a13c0e0)) - **defaultValue:** add support for timestamps and add internal handling ([46f01a2](https://togithub.com/db-migrate/pg/commit/46f01a2))

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