[Snyk] Fix for 1 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile

⚠️ Warning

``` Failed to update the Gemfile.lock, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-RUBY-JSON-560838	No	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

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For more information:

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📚 Read more about Snyk's upgrade and patch logic

[codecov[bot]]

Codecov Report

Merging #16 into master will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   23.21%   23.21%           
=======================================
  Files           5        5           
  Lines         573      573           
=======================================
  Hits          133      133           
  Misses        440      440           

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