Added get_dashboard method (atlassian-api#1109)

* Added request_current_index_from_node method and docs for the cluster methods

* Added description to docs for method get_cluster_all_nodes

* Added get_dashboard method. Ability to get dashboard by ID.

* Fix resource_url for get_dashboard method

Bump version and adjust docs

Bump version to 3.31.0

bump version

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Polish code

Bump version: Jira plugin methods, rest client fix errors

Bump version: Jira new methods, adjustments of error handler, fix in …

…Jira methods

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Add plugins related methods