swith to use opengene.org/plotly-1.2.0.min.js

since the plotly.js CDN is not stable

set version to v0.20.0

fix a bug in fastareader for FASTA with space in name

revise the insert size estimation a little when trim front is enabled

support blank records

OpenGene#133

improve cut_right

OpenGene#122

README revision

Merge pull request OpenGene#81 from yech1990/master

adjust the upper limit for PacBio data

restore to not to delete ofstream

Update README.md