Update dependency grunt-contrib-cssmin to v3

package-lock.json

@@ -2505,20 +2505,12 @@
       }
     },
     "clean-css": {
-      "version": "4.1.11",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.1.11.tgz",
-      "integrity": "sha1-Ls3xRaujj1R0DybO/Q/z4D4SXWo=",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
+      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
       "dev": true,
       "requires": {
-        "source-map": "0.5.x"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
+        "source-map": "~0.6.0"
       }
     },
     "cli": {
@@ -5348,41 +5340,14 @@
       }
     },
     "grunt-contrib-cssmin": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/grunt-contrib-cssmin/-/grunt-contrib-cssmin-2.2.1.tgz",
-      "integrity": "sha512-IXNomhQ5ekVZbDbj/ik5YccoD9khU6LT2fDXqO1+/Txjq8cp0tQKjVS8i8EAbHOrSDkL7/UD6A7b+xj98gqh9w==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-contrib-cssmin/-/grunt-contrib-cssmin-3.0.0.tgz",
+      "integrity": "sha512-eXpooYmVGKMs/xV7DzTLgJFPVOfMuawPD3x0JwhlH0mumq2NtH3xsxaHxp1Y3NKxp0j0tRhFS6kSBRsz6TuTGg==",
       "dev": true,
       "requires": {
-        "chalk": "^1.0.0",
-        "clean-css": "~4.1.1",
+        "chalk": "^2.4.1",
+        "clean-css": "~4.2.1",
         "maxmin": "^2.1.0"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-          "dev": true
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-          "dev": true
-        }
       }
     },
     "grunt-contrib-jshint": {
@@ -6272,7 +6237,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
       "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-finite": {
       "version": "1.0.2",

package.json

@@ -37,7 +37,7 @@
     "grunt-checktextdomain": "1.0.1",
     "grunt-contrib-clean": "1.1.0",
     "grunt-contrib-concat": "1.0.1",
-    "grunt-contrib-cssmin": "2.2.1",
+    "grunt-contrib-cssmin": "3.0.0",
     "grunt-contrib-jshint": "1.1.0",
     "grunt-contrib-uglify": "3.4.0",
     "grunt-contrib-watch": "1.1.0",