chore(devDeps): move all dependencies to devDeps

package.json

@@ -24,14 +24,15 @@
     "url": "https://github.com/SukkaW/DisqusJS/issues"
   },
   "homepage": "https://github.com/SukkaW/DisqusJS#readme",
-  "dependencies": {
-    "@babel/core": "^7.1.2",
-    "@babel/preset-env": "^7.1.0",
-    "gulp": "4",
-    "gulp-autoprefixer": "^7.0.0",
+  "dependencies": {},
+  "devDependencies": {
+    "@babel/core": "^7.10.1",
+    "@babel/preset-env": "^7.10.1",
+    "gulp": "^4.0.2",
+    "gulp-autoprefixer": "^7.0.1",
     "gulp-babel": "^8.0.0",
-    "gulp-clean-css": "^4.0.0",
-    "gulp-header": "^2.0.5",
-    "gulp-uglify": "^3.0.1"
+    "gulp-clean-css": "^4.3.0",
+    "gulp-header": "^2.0.9",
+    "gulp-uglify": "^3.0.2"
   }
 }