Updated readme to display bundle size automatically. Removed hard coded value

# [Codecov](https://codecov.io/gh/lukeed/clsx/pull/32?src=pr&el=h1) Report > Merging [#32](https://codecov.io/gh/lukeed/clsx/pull/32?src=pr&el=desc) (378f995) into [master](https://codecov.io/gh/lukeed/clsx/commit/74cefa60314506f93a4db565c59152c6c0a2295c?el=desc) (74cefa6) will **not change** coverage. > The diff coverage is `n/a`.

[](https://codecov.io/gh/lukeed/clsx/pull/32?src=pr&el=tree)

```diff @@ Coverage Diff @@ ## master #32 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 1 1 Lines 22 22 ========================================= Hits 22 22 ```

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Hi, thank you but I prefer the way it is. It shares format with my other packages.

Plus bundlephobia, when under 1kb, bundlephobia often reports values larger than what they actually are. I have the tooling in place to build the production versions, so it's no trouble to just display the known value.

Thank you though :)