typos
README.md: "formely known as" -> "formerly known as"
# [Codecov](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=h1) Report
> Merging [#816](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/pytorch-transformers/commit/71d597dad0a28ccc397308146844486e0031d701?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=tree)

```diff
@@          Coverage Diff           @@
##           master    #816   +/-   ##
======================================
  Coverage    78.9%   78.9%           
======================================
  Files          34      34           
  Lines        6192    6192           
======================================
  Hits         4886    4886           
  Misses       1306    1306
```



------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=footer). Last update [71d597d...e5a18b3](https://codecov.io/gh/huggingface/pytorch-transformers/pull/816?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>Thanks!