remove bundlephobia badge

bundlephobia now fails with the following error message :

> EntryPointError
> We could not guess a valid entry point for this package. Perhaps the author hasn't specified one in its package.json ?

this might be the same issue : pastelsky/bundlephobia#639

readme.md

@@ -1,6 +1,5 @@
 # BB26
 
-[![Badge indicating minified and gzipped size of BB26](https://badgen.net/bundlephobia/minzip/bb26)](https://bundlephobia.com/result?p=bb26)
 [![Badge indicating number of weekly downloads of BB26 from npm package registry](https://badgen.net/npm/dw/bb26)](https://www.npmjs.com/package/bb26)
 [![Badge indicating percent test coverage of BB26](https://badgen.net/codeclimate/coverage/patrik-csak/BB26?label=test+coverage)](https://codeclimate.com/github/patrik-csak/BB26/test_coverage)