Update examples/ner/run_ner.py
Update the example file by changing the name of AlbertForTokenClassification to AlbertForSequenceClassification.
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=h1) Report
> Merging [#3242](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/a4c75f149269099a98613f51b76cd0b579a109ee?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/3242/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##           master   #3242      +/-   ##
=========================================
- Coverage   77.82%   77.8%   -0.02%     
=========================================
  Files          98      98              
  Lines       16665   16665              
=========================================
- Hits        12970   12967       -3     
- Misses       3695    3698       +3
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/3242/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ191dGlscy5weQ==) | `93.42% <0%> (-0.42%)` | :arrow_down: |

------

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> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=footer). Last update [a4c75f1...340f2a7](https://codecov.io/gh/huggingface/transformers/pull/3242?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>I found that it is not suitable for guideline. 
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