Bump actions/cache from v1 to v2

Created by: dependabot[bot]

Bumps actions/cache from v1 to v2.

Commits

• b820478 Merge pull request #329 from actions/aiyan/v2-release-doc
• e6c708b React to feedback
• 581312b Update readme and examples to use v2
• 9ab9538 Merge pull request #313 from actions/aiyan/use-cache-package
• 6c7d57d Use 0.2.1 cache package
• 2b83e91 Add examples for creating a cache key (#312)
• 1034aae Testing fix for a bug in the cache package
• bcc23b9 React to feeback and change to use 0.2.0 cache package
• 249a220 Update workflow.yml
• 7f9517a Switch cache action to use the cache node package
• Additional commits viewable in compare view

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