BUG: Integer Overflow in read_json with big number in string
- [x] closes #30320
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

The result is only float if all inputs in a column are int/float. Actually, I've used a wrong testcase here, the Error only occurs when both int and str are used for one column. I will rectify that. As for the floats, I will look into keeping the whole column as object instead of float when parsing big numbers. can you merge master and will look again @rohitkg98 if you'd rebase and update for @WillAyd comment. Sorry for the late reply. I'll do it ASAP @jreback @WillAyd  Hello @rohitkg98! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-01-21 03:17:05 UTC lgtm. @WillAyd if you had further questions. Thanks @rohitkg98