feat: update Stata template

[razvanazamfirei]

Pull Request

Thank you for contributing to @toptal/gitignore and https://www.gitignore.io.

New or update

Select the appropriate check box for this pull request. This helps when merging to ensure there are no conflicts with other templates or misunderstandings of how thee template list works.

New

• [ ] Template - New .gitignore template
• [ ] Composition - Template made from smaller templates
• [ ] Inheritance - Template similar to an existing template
• [ ] Patch - Template extending functionality of existing template

Update

• [X] Template - Update existing .gitignore template

Details

This PR updates the list of dataset and output files used in the latest version of Stata 18. The PR also includes all the graphic export formats used by Stata 18.