ENH:read_html() handles tables with multiple header rows #13434
- [ ] closes #13434 
- [ ] read_html() handles tables with multiple header rows 

Now it produces the following output for the issue
  Unnamed: 0  Age Party
0    Hillary   68     D
1     Bernie   74     D
2     Donald   69     R

Could you add tests for the new behavior, a release note, and a sentence (and maybe example) to the documentation? And the travis failure was for a style check. `git diff upstream/master | flake8 --diff`.
 ## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13485?src=pr) is 84.33% (diff: 33.33%)

> Merging [#13485](https://codecov.io/gh/pydata/pandas/pull/13485?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will decrease coverage by **0.90%**

``` diff
@@             master     #13485   diff @@
==========================================
  Files           140        138     -2   
  Lines         50563      51084   +521   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits          43103      43083    -20   
- Misses         7460       8001   +541   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [1e61aed...8629537](https://codecov.io/gh/pydata/pandas/compare/1e61aed165385a9e302ff1afea7eb01bd8bd7ecf...8629537f2c753133ba1436411fc5aae1253b6528?src=pr)
 I think I first overlooked the issue. In the second commit I made a change such that we select the first row of the table that contains  th tags in thead of the table. And this should make previous test cases to pass. I will add some new test cases to test the modified behaviour and also i will change the documentation
 I see that there are no tests added for beautifulsoup parser. is there any reason for that ?. And I think so that is the reason for the decrease in code coverage 
 your test should be called by each parser unless you put it in a specific class (which only exercises specific parsers)
 can you rebase / update?
 needs tests.

please reopen / comment if you are continuing.
