Pin dependencies

package.json

@@ -40,24 +40,24 @@
   },
   "devDependencies": {
     "async": "^2.0.0-rc.4",
-    "cross-env": "^7.0.2",
+    "cross-env": "7.0.2",
     "cypress": "^3.3.1",
-    "grunt": "^1.0.1",
-    "grunt-cli": "^1.2.0",
-    "grunt-concurrent": "^2.3.0",
-    "grunt-contrib-jshint": "^1.0.0",
-    "grunt-contrib-watch": "^1.0.0",
+    "grunt": "1.0.3",
+    "grunt-cli": "1.3.2",
+    "grunt-concurrent": "2.3.1",
+    "grunt-contrib-jshint": "1.1.0",
+    "grunt-contrib-watch": "1.1.0",
     "grunt-env": "latest",
     "grunt-if": "https://github.com/binarymist/grunt-if/tarball/master",
-    "grunt-jsbeautifier": "^0.2.12",
-    "grunt-mocha-test": "^0.12.7",
-    "grunt-npm-install": "^0.3.0",
-    "grunt-retire": "^0.3.12",
-    "mocha": "^2.4.5",
-    "nodemon": "^1.19.1",
-    "selenium-webdriver": "^2.53.2",
-    "should": "^8.3.1",
-    "zaproxy": "^0.2.0"
+    "grunt-jsbeautifier": "0.2.13",
+    "grunt-mocha-test": "0.12.7",
+    "grunt-npm-install": "0.3.1",
+    "grunt-retire": "0.3.12",
+    "mocha": "2.5.3",
+    "nodemon": "1.19.1",
+    "selenium-webdriver": "2.53.3",
+    "should": "8.4.0",
+    "zaproxy": "0.2.0"
   },
   "repository": "https://github.com/OWASP/NodejsGoat",
   "license": "Apache 2.0"