Добавил про object-fit-images полифил в описание

.yaspellerrc

@@ -30,6 +30,7 @@
     "пикс",
     "лид",
     "ктулху",
+    "полифил*",
     "autoprefixer",
     "isMobile",
     "spritesmith",

README.md

@@ -66,6 +66,7 @@
 3. [postcss-import](https://github.com/postcss/postcss-import)
 4. [postcss-inline-svg](https://github.com/TrySound/postcss-inline-svg)
 5. [gulp-cleancss](https://github.com/mgcrea/gulp-cleancss) (только в режиме сборки без карт кода)
+6. [postcss-object-fit-images](https://github.com/ronik-design/postcss-object-fit-images) (в паре с [полифилом](https://github.com/bfred-it/object-fit-images))