[Snyk] Security upgrade typeorm from 0.2.19 to 0.3.0

This PR was automatically created by Snyk using the credentials of a real user.

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	718/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.5	SQL Injection SNYK-JS-TYPEORM-2940870	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

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This change is