TST: release testing of downstream
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=h1) Report
> Merging [#16261](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/e346c663cf76186c22f4d3b703461b1b60db280f?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16261/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16261      +/-   ##
==========================================
- Coverage   90.31%    90.3%   -0.01%     
==========================================
  Files         167      167              
  Lines       50907    50907              
==========================================
- Hits        45977    45972       -5     
- Misses       4930     4935       +5
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.09% <ø> (ø)` | :arrow_up: |
| #single | `40.29% <ø> (-0.1%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `90.68% <0%> (-0.35%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.58% <0%> (-0.1%)` | :arrow_down: |
| [pandas/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL192ZXJzaW9uLnB5) | `44.65% <0%> (+1.9%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16261?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/16261?src=pr&el=footer). Last update [e346c66...a721335](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=h1) Report
> Merging [#16261](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ba60321d00d686a3137ffe26f919d64e84d43aa0?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16261/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16261      +/-   ##
==========================================
- Coverage   90.32%    90.3%   -0.02%     
==========================================
  Files         167      167              
  Lines       50907    50907              
==========================================
- Hits        45982    45972      -10     
- Misses       4925     4935      +10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.09% <ø> (-0.01%)` | :arrow_down: |
| #single | `40.29% <ø> (-0.11%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `90.68% <0%> (-0.35%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.58% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16261?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/16261?src=pr&el=footer). Last update [ba60321...c4c381f](https://codecov.io/gh/pandas-dev/pandas/pull/16261?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 this is just about ready, I am xfailing this for now: https://github.com/pydata/pandas-datareader/pull/304 @TomAugspurger not sure if we are marking backports. But this should go as well because it adds some useful testing. >  not sure if we are marking backports.

Just tag with 0.20.2 (as you did)