build: Updating npm dependencies for security issues

* Updated grunt to 1.0.3, addressing:
  * https://npmjs.com/advisories/577
  * CVE-2018-3721

And updating CoC link to use Special:MyLanguage (T202047).

Change-Id: I0987f766272fcdd2ca251c203ecf88ef14c1547a

CODE_OF_CONDUCT.md

@@ -1 +1 @@
-The development of this software is covered by a [Code of Conduct](https://www.mediawiki.org/wiki/Code_of_Conduct).
+The development of this software is covered by a [Code of Conduct](https://www.mediawiki.org/wiki/Special:MyLanguage/Code_of_Conduct).

package.json

@@ -1,11 +1,11 @@
 {
-  "private": true,
-  "scripts": {
-    "test": "grunt test"
-  },
-  "devDependencies": {
-    "grunt": "1.0.1",
-    "grunt-banana-checker": "0.4.0",
-    "grunt-jsonlint": "1.0.7"
-  }
+	"private": true,
+	"scripts": {
+		"test": "grunt test"
+	},
+	"devDependencies": {
+		"grunt": "1.0.3",
+		"grunt-banana-checker": "0.4.0",
+		"grunt-jsonlint": "1.0.7"
+	}
 }