Update dependency connection-string to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
connection-string	3.4.0 -> 4.3.6
connection-string	^3.2.2 -> ^4.0.0

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Release Notes

vitaly-t/connection-string

v4.3.6

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• Fixed #​52
• Updated dependencies
• Minor refactoring

v4.3.5

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• Adds support for underscore in host names - see PR-50.
• Removed Travis Build+CI integration, because free Travis is no longer available.

v4.3.4

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• Implements #​46, to support browsers better.

v4.3.3

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• Made required NodeJS packages conditional, under NodeJS only. See #​46
• Updated DEV dependencies

v4.3.2

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• Adding official support for NodeJS v15
• Documentation updates
• Dependencies updated

v4.3.1

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• Fixed an issue with #​43, which treated %2C like ,-separator.

See: How to pass arrays of values?

v4.3.0

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• Implemented #​43, improving support for repeated and comma-separated parameters. See: How to pass arrays of values?
• DEV dependencies updated

v4.2.1

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• Minor code refactoring + DEV deps updated.

v4.2.0

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• Implemented #​41 - returning support of : within the protocol.

v4.1.0

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• Extending Virtual Properties, to include host, as alias to hosts?.[0].toString().

v4.0.1

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• Code + tests refactoring.

v4.0.0

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• Implemented #​38, as explained below:

Protocol now allows strictly what the spec says is valid:

protocol = ALPHA * ( ALPHA / DIGIT / "+" / "-" / "." )

And the protocol is no longer encoded or decoded.

MongoDB protocol in the form of mongodb+srv now can be processed automatically.

v3.4.2

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• Docs + DEV dependencies updated.

v3.4.1

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Repackaged distribution, removing an obsolete file from it.

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