Updates a couple of editor dependencies that were lagging

Move webpack manifest plugin to prod dep (failing builds)

package.json

@@ -151,7 +151,7 @@
     "react-helmet": "^5.2.0",
     "react-keydown": "^1.7.3",
     "react-markdown": "^3.0.2",
-    "react-medium-image-zoom": "^3.0.2",
+    "react-medium-image-zoom": "^3.0.10",
     "react-modal": "^3.1.2",
     "react-portal": "^4.0.0",
     "react-router-dom": "^4.2.0",
@@ -166,10 +166,10 @@
     "slate": "^0.31.5",
     "slate-collapse-on-escape": "^0.6.0",
     "slate-edit-code": "^0.13.2",
-    "slate-edit-list": "^0.10.1",
+    "slate-edit-list": "^0.10.2",
     "slate-md-serializer": "^1.0.7",
     "slate-paste-linkify": "^0.5.0",
-    "slate-plain-serializer": "^0.4.15",
+    "slate-plain-serializer": "0.4.13",
     "slate-prism": "^0.4.0",
     "slate-react": "^0.10.19",
     "slate-trailing-block": "^0.4.0",
@@ -184,7 +184,8 @@
     "url-loader": "^0.6.2",
     "uuid": "2.0.2",
     "validator": "5.2.0",
-    "webpack": "3.10.0"
+    "webpack": "3.10.0",
+    "webpack-manifest-plugin": "^1.3.2"
   },
   "devDependencies": {
     "babel-jest": "22",
@@ -200,7 +201,6 @@
     "nodemon": "1.11.0",
     "prettier": "1.8.2",
     "raf": "^3.4.0",
-    "react-test-renderer": "^16.1.0",
-    "webpack-manifest-plugin": "^1.3.2"
+    "react-test-renderer": "^16.1.0"
   }
 }