chore: update depDev

Author: Ivan Demidov

package.json

@@ -50,26 +50,25 @@
     "babel-eslint": "^7.2.3",
     "browser-sync": "^2.18.12",
     "chokidar-cli": "^1.2.0",
-    "clinton": "^0.12.0",
-    "conventional-changelog-cli": "^1.2.0",
-    "conventional-changelog-lint": "^1.1.0",
-    "eslint": "^3.13.1",
-    "eslint-config-xo": "^0.18.1",
+    "clinton": "^0.13.0",
+    "conventional-changelog-cli": "^1.3.1",
+    "conventional-changelog-lint": "^1.1.9",
+    "eslint": "^3.19.0",
+    "eslint-config-xo": "^0.18.2",
     "eslint-formatter-pretty": "^1.1.0",
-    "eslint-plugin-ava": "^4.1.0",
-    "eslint-plugin-babel": "^4.0.1",
-    "eslint-plugin-markdown": "^1.0.0-beta.3",
-    "eslint-plugin-require-path-exists": "^1.1.5",
+    "eslint-plugin-ava": "^4.2.0",
+    "eslint-plugin-babel": "^4.1.1",
+    "eslint-plugin-markdown": "^1.0.0-beta.6",
     "eslint-plugin-xo": "^1.0.0",
     "http-server": "^0.10.0",
-    "husky": "^0.13.2",
-    "np": "^2.13.2",
-    "postcss-at-rules-variables": "0.1.0",
+    "husky": "^0.13.4",
+    "np": "^2.15.0",
+    "postcss-at-rules-variables": "0.1.1",
     "postcss-attribute-selector-prefix": "0.1.0",
     "postcss-calc": "^6.0.0",
     "postcss-class-prefix": "^0.3.0",
     "postcss-clearfix": "^1.0.0",
-    "postcss-cli": "^3.2.0",
+    "postcss-cli": "^4.0.0",
     "postcss-conditionals": "^2.1.0",
     "postcss-csso": "^2.0.0",
     "postcss-custom-properties": "^6.0.1",
@@ -79,20 +78,20 @@
     "postcss-extend": "^1.0.5",
     "postcss-for": "^2.1.1",
     "postcss-initial": "^2.0.0",
-    "postcss-nested": "^2.0.1",
     "postcss-mixins": "^6.0.0",
+    "postcss-nested": "^2.0.2",
     "postcss-reduce-initial": "^1.0.1",
     "postcss-sorting": "^2.1.0",
     "posthtml": "^0.9.2",
-    "posthtml-cli": "0.2.16",
+    "posthtml-cli": "0.3.0",
     "posthtml-extend": "^0.1.2",
     "posthtml-modules": "^0.4.2",
     "posthtml-spaceless": "^0.0.2",
     "rimraf": "^2.6.1",
     "stylefmt": "^6.0.0",
-    "stylelint": "^7.7.1",
+    "stylelint": "^7.10.1",
     "stylelint-config-standard": "^16.0.0",
-    "testcafe": "^0.14.0",
+    "testcafe": "^0.16.0-alpha4",
     "updtr": "^1.0.0"
   },
   "posthtml": {
@@ -143,7 +142,6 @@
       "ava",
       "xo",
       "babel",
-      "require-path-exists",
       "markdown"
     ],
     "extends": [