build: update dependency tslint-config-airbnb to v5.11.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tslint-config-airbnb	5.10.0 -> 5.11.2

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Release Notes

progre/tslint-config-airbnb

v5.11.2

Compare Source

5.11.2 (2019-09-19)

v5.11.1

Compare Source

Bug Fixes

• wrong rule configuration (3abd09c), closes #​56

v5.11.0

Compare Source

Bug Fixes

• remove deprecated rule "no-unused-variable" (5b54968), closes #​54

and a PR

• https://github.com/progre/tslint-config-airbnb/pull/50

Features

• https://github.com/progre/tslint-config-airbnb/pull/49

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[renovate]

Branch automerge failure

This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.

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• Branch has one or more failed status checks

[coveralls]

Coverage remained the same at 99.153% when pulling 5256436 on renovate/tslint-config-airbnb-5.x into d7b86f3 on master.

[renovate]

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