lock packages.json packages to patch versions

package.json

@@ -39,24 +39,24 @@
     "showdown": "bin/showdown.js"
   },
   "devDependencies": {
-    "chai": "4.0.2",
-    "grunt": "1.0.1",
-    "grunt-contrib-clean": "1.0.0",
-    "grunt-contrib-concat": "1.0.1",
-    "grunt-contrib-jshint": "1.1.0",
-    "grunt-contrib-uglify": "3.1.0",
-    "grunt-conventional-changelog": "6.1.0",
-    "grunt-conventional-github-releaser": "1.0.0",
-    "grunt-endline": "0.6.1",
-    "grunt-eslint": "19.0.0",
-    "grunt-simple-mocha": "0.4.0",
-    "load-grunt-tasks": "3.2.0",
-    "performance-now": "2.0.0",
-    "quiet-grunt": "0.2.3",
-    "semver": "5.4.1",
-    "semver-sort": "0.0.4",
-    "sinon": "4.0.0",
-    "source-map-support": "0.5.0"
+    "chai": "4.1.x",
+    "grunt": "^1.0.1",
+    "grunt-contrib-clean": "1.1.x",
+    "grunt-contrib-concat": "1.0.x",
+    "grunt-contrib-jshint": "1.1.x",
+    "grunt-contrib-uglify": "3.2.x",
+    "grunt-conventional-changelog": "6.1.x",
+    "grunt-conventional-github-releaser": "1.0.x",
+    "grunt-endline": "0.6.x",
+    "grunt-eslint": "19.0.x",
+    "grunt-simple-mocha": "0.4.x",
+    "load-grunt-tasks": "3.5.x",
+    "performance-now": "2.0.x",
+    "quiet-grunt": "0.2.x",
+    "semver": "5.4.x",
+    "semver-sort": "0.0.x",
+    "sinon": "4.1.x",
+    "source-map-support": "0.5.x"
   },
   "dependencies": {
     "jsdom": "^9.12.0",