Move @types to dev dependencies (#484)

Author: gfx

package.json

@@ -49,6 +49,14 @@
   },
   "homepage": "https://github.com/TypeStrong/ts-node",
   "devDependencies": {
+    "@types/arrify": "^1.0.1",
+    "@types/diff": "^3.2.1",
+    "@types/minimist": "^1.2.0",
+    "@types/mkdirp": "^0.5.0",
+    "@types/node": "^8.0.27",
+    "@types/source-map-support": "^0.4.0",
+    "@types/v8flags": "types/npm-v8flags#de224ae1cd5fd7dbb4e7158a6cc7a29e5315930d",
+    "@types/yn": "types/npm-yn#ca75f6c82940fae6a06fb41d2d37a6aa9b4ea8e9",
     "@types/chai": "^4.0.4",
     "@types/mocha": "^2.2.42",
     "@types/proxyquire": "^1.3.28",
@@ -67,14 +75,6 @@
     "typescript": "^2.4.1"
   },
   "dependencies": {
-    "@types/arrify": "^1.0.1",
-    "@types/diff": "^3.2.1",
-    "@types/minimist": "^1.2.0",
-    "@types/mkdirp": "^0.5.0",
-    "@types/node": "^8.0.27",
-    "@types/source-map-support": "^0.4.0",
-    "@types/v8flags": "types/npm-v8flags#de224ae1cd5fd7dbb4e7158a6cc7a29e5315930d",
-    "@types/yn": "types/npm-yn#ca75f6c82940fae6a06fb41d2d37a6aa9b4ea8e9",
     "arrify": "^1.0.0",
     "chalk": "^2.3.0",
     "diff": "^3.1.0",