Update dependency openapi3-ts to v2

[vingle-suzy]

This PR contains the following updates:

Package	Type	Update	Change
openapi3-ts	dependencies	major	^1.3.0 -> ^2.0.0

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Release Notes

metadevpro/openapi3-ts

v2.0.1

Compare Source

2020.12.31

• Updated testing libs
• Added ESList + Prettier, removed TSList support
• Refactor to be consistent with ESLint + Prettier code-style rules
• No functional changes in this version: just end of year house-keeping.

v2.0.0

Compare Source

2020.09.18

• Added Yaml Support and the first dependence to yaml library. Thanks to @​DMavani
• Better typing for type and format properties. Thanks to @​xeptore
• Keeping extensibility on format.

v1.4.0

Compare Source

2020.06.06

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