Ignore warnings when reading pickle files
Silences a warning from our tests about

```
pandas/tests/io/test_common.py::TestCommonIOCapabilities::()::test_read_fspath_all[reader10-os-/home/travis/build/pandas-dev/pandas/pandas/tests/io/data/categorical_0_14_1.pickle]
  /home/travis/build/pandas-dev/pandas/pandas/io/pickle.py:99: FutureWarning: 'pandas.core' is private. Use 'pandas.Categorical'
    return read_wrapper(lambda f: pkl.load(f))
```
we. an move up our pickle compat as well
i think we r at 0.13 maybe move to 0.17

maybe make a new issue for this https://github.com/pandas-dev/pandas/issues/19581

On Wed, Feb 7, 2018 at 11:46 AM, Jeff Reback <notifications@github.com>
wrote:

> we. an move up our pickle compat as well
> i think we r at 0.13 maybe move to 0.17
>
> maybe make a new issue for this
>
> —
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> .
>
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19580?src=pr&el=h1) Report
> Merging [#19580](https://codecov.io/gh/pandas-dev/pandas/pull/19580?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/50528421ae79b27a26b32ba715b17271c8dfda7e?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19580/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/19580?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19580      +/-   ##
==========================================
+ Coverage   91.62%   91.62%   +<.01%     
==========================================
  Files         150      150              
  Lines       48773    48790      +17     
==========================================
+ Hits        44687    44703      +16     
- Misses       4086     4087       +1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.99% <ø> (ø)` | :arrow_up: |
| #single | `41.73% <ø> (-0.02%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19580?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/category.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9jYXRlZ29yeS5weQ==) | `97.26% <0%> (-0.26%)` | :arrow_down: |
| [pandas/core/groupby.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ3JvdXBieS5weQ==) | `92.12% <0%> (-0.05%)` | :arrow_down: |
| [pandas/core/sparse/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3BhcnNlL2ZyYW1lLnB5) | `94.81% <0%> (ø)` | :arrow_up: |
| [pandas/core/indexing.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhpbmcucHk=) | `93.11% <0%> (ø)` | :arrow_up: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.42% <0%> (ø)` | :arrow_up: |
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `95.93% <0%> (+0.01%)` | :arrow_up: |
| [pandas/core/reshape/merge.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS9tZXJnZS5weQ==) | `94.25% <0%> (+0.03%)` | :arrow_up: |
| [pandas/core/arrays/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/19580/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2NhdGVnb3JpY2FsLnB5) | `94.87% <0%> (+0.13%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19580?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/pandas-dev/pandas/pull/19580?src=pr&el=footer). Last update [5052842...b0b37ff](https://codecov.io/gh/pandas-dev/pandas/pull/19580?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!