Make "regexps" member an array, not a string
Make "regexps" member an array, not a string

This makes this field name less surprising.

Although we only currently use one regexp, so maybe this should be made
a string afterall, and the variable renamed

gdh1995/vimium,smblott-github/vimium,gdh1995/vimium,gdh1995/vimium,smblott-github/vimium,philc/vimium,smblott-github/vimium,philc/vimium,philc/vimium