build: Updating npm dependencies for security issues

* Updated grunt-contrib-watch to 1.1.0, addressing:
  * https://npmjs.com/advisories/534
  * CVE-2017-16137
  * https://npmjs.com/advisories/577
  * CVE-2018-3721

Change-Id: I14bb6101b4d8068704c9c15bac1e28cccfbe037e

package.json

@@ -1,23 +1,23 @@
 {
-  "name": "flow",
-  "version": "0.0.0",
-  "private": true,
-  "description": "Build tools for Flow.",
-  "scripts": {
-    "test": "grunt test",
-    "doc": "jsduck"
-  },
-  "devDependencies": {
-    "eslint-config-wikimedia": "0.8.1",
-    "eslint-plugin-qunit": "3.3.1",
-    "grunt": "1.0.3",
-    "grunt-banana-checker": "0.6.0",
-    "grunt-contrib-watch": "1.0.0",
-    "grunt-eslint": "21.0.0",
-    "grunt-jsonlint": "1.1.0",
-    "grunt-stylelint": "0.10.1",
-    "grunt-tyops": "0.1.0",
-    "stylelint": "9.2.0",
-    "stylelint-config-wikimedia": "0.4.3"
-  }
+	"name": "flow",
+	"version": "0.0.0",
+	"private": true,
+	"description": "Build tools for Flow.",
+	"scripts": {
+		"test": "grunt test",
+		"doc": "jsduck"
+	},
+	"devDependencies": {
+		"eslint-config-wikimedia": "0.8.1",
+		"eslint-plugin-qunit": "3.3.1",
+		"grunt": "1.0.3",
+		"grunt-banana-checker": "0.6.0",
+		"grunt-contrib-watch": "1.1.0",
+		"grunt-eslint": "21.0.0",
+		"grunt-jsonlint": "1.1.0",
+		"grunt-stylelint": "0.10.1",
+		"grunt-tyops": "0.1.0",
+		"stylelint": "9.2.0",
+		"stylelint-config-wikimedia": "0.4.3"
+	}
 }