fix 'yarn audit' failures #36
                
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Currently, running
yarn auditreveals a bunch of potential vulnerabilities.This should not be an issue for most situations, since they originate from the text fixture setup and do not impact the source code
However, developers at some organisations would find it convenient to get this package through their security checks by upgrading the
devDependenciesThis PR aims to achieve the above.
Reference: https://javascriptbit.com/yarn-audit-fix-security-issues/