Bumping dependencies

package.json

@@ -29,13 +29,13 @@
   },
   "homepage": "https://github.com/GoogleChrome/selenium-assistant#readme",
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.0.2",
     "chromedriver": "^2.26.1",
     "coveralls": "^2.11.12",
     "eslint": "^3.12.1",
-    "eslint-config-google": "^0.7.1",
+    "eslint-config-google": "^0.8.0",
     "express": "^4.14.0",
-    "firebase": "^3.5.1",
+    "firebase": "^4.1.2",
     "geckodriver": "^1.6.0",
     "glob": "^7.1.1",
     "istanbul": "^0.4.5",
@@ -47,9 +47,9 @@
   },
   "dependencies": {
     "chalk": "^1.1.3",
-    "del": "^2.2.0",
+    "del": "^3.0.0",
     "dmg": "^0.1.0",
-    "fs-extra": "^2.1.2",
+    "fs-extra": "^3.0.1",
     "mkdirp": "^0.5.1",
     "node-localstorage": "^1.3.0",
     "request": "^2.78.0",

test/browser-usage.js

@@ -90,7 +90,7 @@ describe('Test Usage of Browsers', function() {
     prettyName.length.should.gt(1);
 
     const options = specificBrowser.getSeleniumOptions();
-    expect(options).to.be.defined;
+    expect(options).to.exist;
 
     const executablePath = specificBrowser.getExecutablePath();
     (typeof executablePath).should.equal('string');