Dropping IE8 support - it is now on an opt-in basis

[annez]

IE8 support has been dropped from media queries and from autoprefixer defaults.

Our defaults are now as follows:

• "last 5 versions"
• "Firefox ESR"
• "Opera > 18"
• "> 1%"
• "not Explorer < 9"

This adds in $media-query-legacy-support as a variable in our respond-to mixin that is set to false by default.

Upgrading ustyle to this will results in this:

@include respond-to(tablet, true) {
  .test {     
    display: none;
  }
}

To output

@media screen and (min-width: 768px) {
  .test {
    display: none;
  }
}

Previously, an .ie8 class fallback of the repeated style would be pre-processed as true tells us to support IE8 fallbacks. To revert to this functionality to support IE8, please set:

$media-query-legacy-support: true;

In your application.

Other changes

• Upgrading autoprefixer for the grunt task
• Upgrading our copyright notice
• Upgrading docs to reflect support

[greenie]

🎉