[Snyk] Security upgrade mdl from 0.9.0 to 0.10.0

[travi]

Snyk has created this PR to fix 2 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• test/Gemfile
• test/Gemfile.lock

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled Resource Consumption ('Resource Exhaustion') SNYK-RUBY-REXML-7577227	738
	Denial of Service (DoS) SNYK-RUBY-REXML-7577228	631

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[!IMPORTANT]

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• Max score is 1000. Note that the real score may have changed since the PR was raised.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Uncontrolled Resource Consumption ('Resource Exhaustion')

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