update(gitignore): do not ignore app/jspm_packages
update(gitignore): do not ignore app/jspm_packages

BenjaminMercier19/Challenge-Orange,seungyol/seungyol.github.io,BenjaminMercier19/Challenge-Orange,balajipulluru/Material-Step1,balajipulluru/Material-Step1,seungyol/seungyol.github.io,angular/material-start,ceddecedric/qwirk,ceddecedric/qwirk,angular/material-start