Release v1.0.0-alpha.2

Added

• [MultiSelect] add scoped slot option

Fixed

• [Modal] If two modals share the same v-if condition the calculated z-index is incorrect, resulting in popover misbehaviour. (fixed #342)
• [Modal] Popovers within nested modals do not appear on top (z-index issue). (fixed #341)

Others

• split .vue files into .vue and .js for better coverage support.
• tests improvement
• migrate CI to Github Actions from Travis