Update packages

Author: langpavel

package.json

@@ -28,7 +28,7 @@
     "graphql-relay": "^0.5.1",
     "graphql-sequelize": "^5.3.2",
     "history": "^4.6.3",
-    "isomorphic-style-loader": "^2.0.0",
+    "isomorphic-style-loader": "^3.0.0",
     "jsonwebtoken": "^7.4.1",
     "node-fetch": "^1.7.1",
     "normalize.css": "^7.0.0",
@@ -97,9 +97,9 @@
     "null-loader": "^0.1.1",
     "opn-cli": "^3.1.0",
     "node-sass": "4.5.0",
-    "pixrem": "^3.0.2",
+    "pixrem": "^4.0.1",
     "pleeease-filters": "^4.0.0",
-    "postcss": "^6.0.3",
+    "postcss": "^6.0.4",
     "postcss-calc": "^6.0.0",
     "postcss-color-function": "^4.0.0",
     "postcss-custom-media": "^6.0.0",
@@ -111,7 +111,7 @@
     "postcss-media-minmax": "^3.0.0",
     "postcss-nested": "^2.0.2",
     "postcss-nesting": "^4.0.1",
-    "postcss-pseudoelements": "^4.0.0",
+    "postcss-pseudoelements": "^5.0.0",
     "postcss-selector-matches": "^3.0.1",
     "postcss-selector-not": "^3.0.1",
     "raw-loader": "^0.5.1",