Use exact versions for devDependencies

package.json

@@ -60,38 +60,38 @@
     "start": "babel-node examples/index.js"
   },
   "dependencies": {
-    "accepts": "^1.3.0",
+    "accepts": "^1.3.5",
     "content-type": "^1.0.4",
-    "http-errors": "^1.3.0",
-    "raw-body": "^2.3.2"
+    "http-errors": "^1.7.0",
+    "raw-body": "^2.3.3"
   },
   "devDependencies": {
-    "babel-cli": "^6.26.0",
-    "babel-eslint": "^9.0.0",
+    "babel-cli": "6.26.0",
+    "babel-eslint": "9.0.0",
     "babel-plugin-transform-async-to-generator": "6.24.1",
     "babel-plugin-transform-class-properties": "6.24.1",
     "babel-plugin-transform-flow-strip-types": "6.22.0",
-    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-plugin-transform-runtime": "6.23.0",
     "babel-preset-es2015": "6.24.1",
-    "babel-register": "^6.26.0",
-    "babel-runtime": "^6.26.0",
+    "babel-register": "6.26.0",
+    "babel-runtime": "6.26.0",
     "body-parser": "1.18.3",
-    "chai": "^4.1.2",
+    "chai": "4.1.2",
     "connect": "3.6.6",
     "coveralls": "3.0.2",
-    "eslint": "^5.5.0",
-    "eslint-plugin-flowtype": "^2.44.0",
-    "eslint-plugin-prettier": "^2.6.0",
-    "express": "^4.16.2",
-    "flow-bin": "^0.80.0",
+    "eslint": "5.5.0",
+    "eslint-plugin-flowtype": "2.50.0",
+    "eslint-plugin-prettier": "2.6.2",
+    "express": "4.16.3",
+    "flow-bin": "0.80.0",
     "graphql": "14.0.0",
     "isparta": "4.1.0",
     "mocha": "5.2.0",
     "multer": "1.3.1",
-    "prettier": "^1.10.2",
+    "prettier": "1.14.2",
     "restify": "4.3.2",
     "sane": "3.0.0",
-    "sinon": "^6.1.5",
+    "sinon": "6.1.5",
     "supertest": "3.1.0"
   },
   "peerDependencies": {