Update dependencies

package.json

@@ -28,45 +28,45 @@
     "chai": "4.1.1",
     "chai-as-promised": "7.1.1",
     "chai-subset": "1.6.0",
-    "chokidar": "^1.7.0",
-    "chrome-launcher": "^0.8.1",
-    "chrome-remote-interface": "^0.25.2",
-    "chrome-unmirror": "^0.1.0",
+    "chokidar": "1.7.0",
+    "chrome-launcher": "0.8.1",
+    "chrome-remote-interface": "0.25.4",
+    "chrome-unmirror": "0.1.0",
     "extend": "3.0.1",
-    "find-up": "^2.1.0",
+    "find-up": "2.1.0",
     "globby": "6.1.0",
     "handlebars": "4.0.10",
     "highlight.js": "9.12.0",
-    "import-cwd": "^2.1.0",
+    "import-cwd": "2.1.0",
     "jimp": "0.2.28",
-    "koa": "^2.3.0",
-    "koa-favicon": "^2.0.0",
-    "koa-rewrite": "^3.0.0",
-    "koa-static": "^4.0.1",
+    "koa": "2.4.1",
+    "koa-favicon": "2.0.0",
+    "koa-rewrite": "3.0.0",
+    "koa-static": "4.0.2",
     "mkdirp": "0.5.1",
     "mocha": "4.0.1",
     "moment": "2.18.1",
-    "nyc": "^11.3.0",
-    "precinct": "^3.8.0",
+    "nyc": "11.4.0",
+    "precinct": "3.8.0",
     "sinon": "4.0.1",
     "sinon-chai": "2.14.0",
-    "source-map-support": "^0.5.0",
-    "test-exclude": "^4.1.1",
-    "yargs": "^10.0.3"
+    "source-map-support": "0.5.0",
+    "test-exclude": "4.1.1",
+    "yargs": "10.0.3"
   },
   "devDependencies": {
-    "@types/chai": "^4.0.5",
-    "@types/mocha": "^2.2.44",
-    "babel-core": "^6.26.0",
-    "babel-plugin-istanbul": "^4.1.5",
-    "babel-preset-env": "^1.6.1",
-    "babel-register": "^6.26.0",
-    "coveralls": "^3.0.0",
+    "@types/chai": "4.0.5",
+    "@types/mocha": "2.2.44",
+    "babel-core": "6.26.0",
+    "babel-plugin-istanbul": "4.1.5",
+    "babel-preset-env": "1.6.1",
+    "babel-register": "6.26.0",
+    "coveralls": "3.0.0",
     "eslint": "4.8.0",
     "eslint-config-airbnb-base": "12.0.2",
     "eslint-plugin-import": "2.7.0",
-    "requirejs": "^2.3.5",
-    "typescript": "^2.6.1"
+    "requirejs": "2.3.5",
+    "typescript": "2.6.1"
   },
   "engines": {
     "node": "> 8"