message: webpack-plugin: update to current autoprefixer
  moz-placeholder was added to autoprefixer output as well
diff: @@ -22,9 +22,14 @@ describe(`(${project})`, () => {
  const styleElements = await page.evaluate(browserFunctions.getStyleElementsMetadata, true);
  // tslint:disable:max-line-length
  - expect(styleElements).to.eql([{ id: './src/index.st.css', depth: '1',
  - css: '::-webkit-input-placeholder {\n color: gray;\n}\n:-ms-input-placeholder {\n color: gray;\n}\n::-ms-input-placeholder {\n color: gray;\n}\n::placeholder {\n color: gray;\n}'
  - }]);
  + expect(styleElements).to.eql([
  + {
  + id: './src/index.st.css',
  + depth: '1',
  + css:
  + '::-webkit-input-placeholder {\n color: gray;\n}\n::-moz-placeholder {\n color: gray;\n}\n:-ms-input-placeholder {\n color: gray;\n}\n::-ms-input-placeholder {\n color: gray;\n}\n::placeholder {\n color: gray;\n}'
  + }
  + ]);
  // tslint:enable:max-line-length
  });
  });
  