Add small tag

[dood-]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#150

[what-the-diff[bot]]

• Added Small tag
• Added test for the new tag

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (c7eb322) compared to base (1908096). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #152 +/- ## =========================================== Coverage 100.00% 100.00% - Complexity 755 759 +4 =========================================== Files 83 84 +1 Lines 2045 2052 +7 =========================================== + Hits 2045 2052 +7 ``` | [Impacted Files](https://codecov.io/gh/yiisoft/html/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft) | Coverage Δ | | |---|---|---| | [src/Html.php](https://codecov.io/gh/yiisoft/html/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft#diff-c3JjL0h0bWwucGhw) | `100.00% <100.00%> (ø)` | | | [src/Tag/Small.php](https://codecov.io/gh/yiisoft/html/pull/152?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft#diff-c3JjL1RhZy9TbWFsbC5waHA=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft)

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[vjik]

Thanks, @dood- 👍