Update sensu-plugin requirement from ~> 2.6 to >= 2.6, < 4.0

[dependabot-preview[bot]]

Updates the requirements on sensu-plugin to permit the latest version.

Changelog

*Sourced from [sensu-plugin's changelog](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md).* > ## [3.0.0] - 2018-12-04 > ### Breaking Changes > - renamed event mapping utility function `map_v2_event_into_v1` to match naming change to Sensu Go `map_go_event_into_ruby` ([**jspaleta**](https://github.com/jspaleta)) > - renamed mutator and handler mixin arguments from `--map-v2-event-into-v1` to match naming change to Sensu Go `--map-go-event-into-ruby` ([**jspaleta**](https://github.com/jspaleta)) > - renamed envar option from `SENSU_MAP_V2_EVENT_INTO_V1` to `SENSU_MAP_GO_EVENT_INTO_RUBY` ([**jspaleta**](https://github.com/jspaleta)) > - updated `map_go_event_into_ruby` logic to account for entity attribute refactor ([**jspaleta**](https://github.com/jspaleta)) > - > ### Added > - `map_go_event_info_ruby` now takes optional `map_annotation` argument to indicate annotation key > holding json string to be mapped into ruby entity attributes > default value is "sensu.io.json_attributes" > optional envvar SENSU_MAP_ANNOTATION to use as environment override ([**jspaleta**](https://github.com/jspaleta)) > - add mutator-go-into-ruby.rb binary. This mutator command can be used to mutate Sensu Go events into Sensu Core 1.x events ([**jspaleta**](https://github.com/jspaleta)) > > ## [2.7.0] - 2018-09-12 > ### Added > - Added map_v2_event_into_v1 method to Utils for all plugin classes to use. ([**jspaleta**](https://github.com/jspaleta)) > - Added --map-v2-event-into-v1 runtime commandline option to base Handler and Mutator classes. ([**jspaleta**](https://github.com/jspaleta)) > - Alternatively set envvar SENSU_MAP_V2_EVENT_INTO_V1=1 and handlers/mutators will automatically attempt to map 2.x event data. ([**jspaleta**](https://github.com/jspaleta)) > - New cli option/envvar makes it possible to use sensu-plugin based handlers/mutators > with Sensu 2.0 events until they provide native 2.0 event support internally. ([**jspaleta**](https://github.com/jspaleta)) > - Mapping function sets and checks for boolean event attribute 'v2_event_mapped_into_v1', > to prevent mapping from running multiple times in same pipeline. ([**jspaleta**](https://github.com/jspaleta)) > > ## [2.6.0] - 2018-08-28 > ### Fixed > - Fix `paginated_get` for backward compatibility with Sensu API < 1.4 ([**cwjohnston**](https://github.com/cwjohnston)). > > ## [2.6.0] - 2018-08-28 > ### Added > - Added utils method `paginated_get` for iteratively retrieving API responses ([**cwjohnston**](https://github.com/cwjohnston)). > > ## [2.5.0] - 2018-04-03 > ### Added > - Added Handler Sensu API HTTPS support through API configuration (e.g. `{"api": {"ssl": {}}` ([**portertech**](https://github.com/portertech)). > > ## [2.4.0] - 2018-02-08 > ### Added > - Added subclass for Generic metrics output to support multiple metrics output formats ([**bergerx**](https://github.com/bergerx)) > > ### Changed > - updated metrics class inheritance hierarchy ([**bergerx**](https://github.com/bergerx)) > > ## [2.3.0] - 2017-08-17 > ### Added > - Added subclass for InfluxDB output ([**luisdavim**](https://github.com/luisdavim)) > - Added subclass for DogStatsD output ([**luisdavim**](https://github.com/luisdavim)) > > ### Changed > - updated changelog to be more inline with current standard for plugins ([**majormoses**](https://github.com/majormoses)) > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/sensu-plugins/sensu-plugin/commits/3.0.0)

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[dependabot-preview[bot]]

Superseded by #79.