build: Update devDependencies

eslint-config-wikimedia      0.5.0  →   0.9.0
 grunt-eslint                20.1.0  →  21.0.0
 grunt-stylelint              0.9.0  →  0.10.1
 stylelint                    8.2.0  →   9.2.0
 stylelint-config-wikimedia   0.4.2  →   0.4.3

Change-Id: I42a46e01cc0a2a183c5d924fd57f05e1925337e2

.eslintrc.json

@@ -1,10 +1,9 @@
 {
-	"extends": "wikimedia",
-	"env": {
-		"browser": true
-	},
+	"extends": [
+		"wikimedia/client",
+		"wikimedia/jquery"
+	],
 	"globals": {
-		"mw": false,
-		"$": false
+		"mw": false
 	}
 }

package.json

@@ -4,13 +4,13 @@
 		"test": "grunt test"
 	},
 	"devDependencies": {
-		"eslint-config-wikimedia": "0.5.0",
+		"eslint-config-wikimedia": "0.9.0",
 		"grunt": "1.0.3",
 		"grunt-banana-checker": "0.6.0",
-		"grunt-eslint": "20.1.0",
+		"grunt-eslint": "21.0.0",
 		"grunt-jsonlint": "1.1.0",
-		"grunt-stylelint": "0.9.0",
-		"stylelint": "8.2.0",
-		"stylelint-config-wikimedia": "0.4.2"
+		"grunt-stylelint": "0.10.1",
+		"stylelint": "9.2.0",
+		"stylelint-config-wikimedia": "0.4.3"
 	}
 }