Move the browserslist config to a separate file.

Author: XhmikosR

.browserslistrc

@@ -0,0 +1,13 @@
+# https://github.com/browserslist/browserslist#readme
+
+>= 1%
+last 1 major version
+not dead
+Chrome >= 45
+Firefox >= 38
+Edge >= 12
+Explorer >= 10
+iOS >= 9
+Safari >= 9
+Android >= 4.4
+Opera >= 30

package.json

@@ -152,19 +152,6 @@
     "js/{src,dist}/",
     "scss/"
   ],
-  "browserslist": [
-    ">= 1%",
-    "last 1 major version",
-    "not dead",
-    "Chrome >= 45",
-    "Firefox >= 38",
-    "Edge >= 12",
-    "Explorer >= 10",
-    "iOS >= 9",
-    "Safari >= 9",
-    "Android >= 4.4",
-    "Opera >= 30"
-  ],
   "bundlesize": [
     {
       "path": "./dist/css/bootstrap-grid.css",