Manhattan plot for bioinformatitians
Hi everyone,
I'm a pandas user and just wanted to contribute but it was very complicated to commit as a developer...
BTW, I added Manhattan plot which is very popular in genetics and biology
Here is the R equivalent
https://cran.r-project.org/web/packages/qqman/qqman.pdf
## Cheers,

ARYA
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master | flake8 --diff`
- [ ] whatsnew entry
