fix gorhill#3111

new version for stable release

new revision for release candidate

new revision for release candidate

new revision for stable release

new revision for stable release

new revision for release build

new release: skip webext-hybrid and go pure webext

fix AMO error: "Legacy add-ons are not compatible with Firefox 57 or …

…higher. Use a maxVersion of 56.* or lower"

new revision for stable release