Fix type annotation in pandas. version
Also remove this module from `mypy.ini`

- [ ] closes #25948 
- [ ] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

It's a little hard for me figure out what exactly is the type if key/values of the dictionary of both the variables I have typed. Please take a look if it's alright. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=h1) Report
> Merging [#25949](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c7c4c94389103c017e950b37191d7c267a75fa22?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/25949/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #25949      +/-   ##
==========================================
- Coverage   91.82%   91.81%   -0.01%     
==========================================
  Files         175      175              
  Lines       52581    52581              
==========================================
- Hits        48280    48275       -5     
- Misses       4301     4306       +5
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.36% <ø> (ø)` | :arrow_up: |
| #single | `41.9% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `75% <0%> (-12.5%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `96.79% <0%> (-0.12%)` | :arrow_down: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `90.63% <0%> (-0.11%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25949?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/25949?src=pr&el=footer). Last update [c7c4c94...802873e](https://codecov.io/gh/pandas-dev/pandas/pull/25949?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/25949?src=pr&el=h1) Report
> Merging [#25949](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c7c4c94389103c017e950b37191d7c267a75fa22?src=pr&el=desc) will **decrease** coverage by `2.08%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25949/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #25949      +/-   ##
==========================================
- Coverage   91.82%   89.73%   -2.09%     
==========================================
  Files         175      175              
  Lines       52581    56159    +3578     
==========================================
+ Hits        48280    50397    +2117     
- Misses       4301     5762    +1461
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.4% <ø> (+0.04%)` | :arrow_up: |
| #single | `43.21% <ø> (+1.24%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYmFzZS5weQ==) | `77.55% <0%> (-20.22%)` | :arrow_down: |
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `82.37% <0%> (-16.22%)` | :arrow_down: |
| [pandas/core/arrays/sparse.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL3NwYXJzZS5weQ==) | `77.46% <0%> (-14.72%)` | :arrow_down: |
| [pandas/core/series.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc2VyaWVzLnB5) | `80.73% <0%> (-12.94%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `75% <0%> (-12.5%)` | :arrow_down: |
| [pandas/io/formats/format.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvZm9ybWF0LnB5) | `86.83% <0%> (-11.05%)` | :arrow_down: |
| [pandas/io/parsers.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3BhcnNlcnMucHk=) | `85.34% <0%> (-10.45%)` | :arrow_down: |
| [pandas/core/internals/construction.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2NvbnN0cnVjdGlvbi5weQ==) | `86.29% <0%> (-9.6%)` | :arrow_down: |
| [pandas/compat/pickle\_compat.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvbXBhdC9waWNrbGVfY29tcGF0LnB5) | `61% <0%> (-8.14%)` | :arrow_down: |
| [pandas/core/reshape/util.py](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS91dGlsLnB5) | `92.59% <0%> (-7.41%)` | :arrow_down: |
| ... and [19 more](https://codecov.io/gh/pandas-dev/pandas/pull/25949/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25949?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/25949?src=pr&el=footer). Last update [c7c4c94...3ed8317](https://codecov.io/gh/pandas-dev/pandas/pull/25949?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Someone please take a look at the travis tests. It has passed on travis but it's stuck on pending here for quite some time. Just restarted it to make sure this is fine, we don't expect to edit this file anyhow, its just for import time versions