Set version packages and add lock file, this is much safer.

package.json

@@ -21,25 +21,23 @@
     "url": "https://github.com/sparksuite/simplemde-markdown-editor/issues"
   },
   "dependencies": {
-    "codemirror": "*",
+    "codemirror": "^5.32.0",
-    "codemirror-spell-checker": "*",
+    "codemirror-spell-checker": "^1.1.2",
-    "marked": "*"
+    "marked": "^0.3.7"
   },
   "devDependencies": {
-    "browserify": "*",
+    "browserify": "^14.5.0",
-    "debug": "*",
+    "gulp": "^3.9.1",
-    "eslint": "*",
+    "gulp-clean-css": "^3.9.0",
-    "gulp": "*",
+    "gulp-concat": "^2.6.1",
-    "gulp-concat": "*",
+    "gulp-debug": "^3.1.0",
-    "gulp-debug": "*",
+    "gulp-eslint": "^4.0.0",
-    "gulp-eslint": "*",
+    "gulp-header": "^1.8.9",
-    "gulp-header": "*",
+    "gulp-jsbeautifier": "^2.1.1",
-    "gulp-jsbeautifier": "*",
+    "gulp-rename": "^1.2.2",
-    "gulp-clean-css": "*",
+    "gulp-uglify": "^3.0.0",
-    "gulp-rename": "*",
+    "vinyl-buffer": "^1.0.0",
-    "gulp-uglify": "*",
+    "vinyl-source-stream": "^1.1.0"
-    "vinyl-source-stream": "*",
-    "vinyl-buffer": "*"
   },
   "repository": {
     "type": "git",