Improving license clarity of simplehtmlparser.js

[hyandell]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe: License documentation

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [x ] It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

The licensing in src/compiler/parser/html-parser.js is described as "Mozilla Public License", which will cause flags of concern for some reviewers as it takes Vue from being an MIT licensed project to a project containing copyleft licensing. This is unnecessary as the original code appears to have an option of three licenses. I've updated the text to describe the three licenses using SPDX license expression format.

[vue-bot]

That's amazing! @hyandell, we just merged your PR to vue! Thank you for your time! 💚

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