update astropy_helpers to next bug fix (v1.0.6)
update astropy_helpers to next bug fix (v1.0.6)

The update to 1.1 will be done later.

Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy