Update package versions and remove unused ones

Author: joybro

package.json

@@ -21,11 +21,11 @@
   "author": "",
   "dependencies": {
     "aws-sdk": "^2.49.0",
-    "aws-serverless-express": "^2.1.3",
+    "aws-serverless-express": "^3.0.2",
     "axios": "^0.16.2",
     "babel-polyfill": "^6.26.0",
     "body-parser": "^1.17.2",
-    "connect-dynamodb": "^1.0.12",
+    "connect-dynamodb": "^2.0.0",
     "express": "^4.14.1",
     "express-session": "^1.15.5",
     "prop-types": "^15.5.9",
@@ -45,21 +45,20 @@
     "babel-loader": "^7.0.0",
     "babel-preset-env": "^1.6.0",
     "babel-preset-react": "^6.22.0",
-    "chai": "^3.5.0",
+    "chai": "^4.1.2",
     "core-js": "^2.5.0",
     "css-loader": "^0.28.0",
     "enzyme": "^2.7.1",
-    "eslint": "^3.15.0",
+    "eslint": "^4.6.0",
     "eslint-loader": "^1.6.1",
-    "eslint-plugin-react": "^6.10.0",
-    "if-env": "^1.0.0",
+    "eslint-plugin-react": "^7.3.0",
     "mocha": "^3.2.0",
     "mocha-webpack": "^0.7.0",
-    "node-lambda": "^0.9.0",
+    "node-lambda": "^0.11.3",
     "react-addons-test-utils": "^15.5.1",
     "react-test-renderer": "^15.5.4",
-    "style-loader": "^0.16.1",
-    "webpack": "^2.2.1",
+    "style-loader": "^0.18.2",
+    "webpack": "^3.5.5",
     "webpack-dev-server": "^2.3.0",
     "webpack-merge": "^4.1.0"
   }