Update devDependencies.

Held babel back due to issues with `objectSpread`.

package.json

@@ -107,52 +107,52 @@
     "popper.js": "^1.15.0"
   },
   "devDependencies": {
-    "@babel/cli": "^7.4.4",
-    "@babel/core": "^7.4.5",
-    "@babel/plugin-proposal-object-rest-spread": "^7.4.4",
-    "@babel/preset-env": "^7.4.5",
-    "autoprefixer": "^9.6.0",
+    "@babel/cli": "7.4.4",
+    "@babel/core": "7.4.5",
+    "@babel/plugin-proposal-object-rest-spread": "7.4.4",
+    "@babel/preset-env": "7.4.5",
+    "autoprefixer": "^9.6.1",
     "babel-eslint": "^10.0.2",
     "babel-plugin-istanbul": "^5.1.4",
     "bundlesize": "^0.18.0",
     "clean-css-cli": "^4.3.0",
-    "coveralls": "^3.0.4",
+    "coveralls": "^3.0.5",
     "cross-env": "^5.2.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.0.1",
     "eslint-config-xo": "^0.26.0",
-    "eslint-plugin-import": "^2.17.3",
-    "eslint-plugin-unicorn": "^9.1.0",
-    "find-unused-sass-variables": "^0.4.0",
+    "eslint-plugin-import": "^2.18.0",
+    "eslint-plugin-unicorn": "^9.1.1",
+    "find-unused-sass-variables": "^0.4.1",
     "glob": "^7.1.4",
     "hammer-simulator": "0.0.1",
     "http-server": "^0.11.1",
     "hugo-bin": "^0.43.6",
     "ip": "^1.1.5",
     "jquery": "^3.4.1",
-    "karma": "^4.1.0",
+    "karma": "^4.2.0",
     "karma-browserstack-launcher": "^1.5.1",
-    "karma-chrome-launcher": "^2.2.0",
+    "karma-chrome-launcher": "^3.0.0",
     "karma-coverage-istanbul-reporter": "^2.0.5",
     "karma-detect-browsers": "^2.3.3",
     "karma-firefox-launcher": "^1.1.0",
-    "karma-qunit": "^3.1.2",
+    "karma-qunit": "^4.0.0",
     "karma-sinon": "^1.0.5",
-    "linkinator": "^1.4.3",
+    "linkinator": "^1.5.0",
     "node-sass": "^4.12.0",
     "nodemon": "^1.19.1",
     "npm-run-all": "^4.1.5",
     "popper.js": "^1.15.0",
-    "postcss-cli": "^6.1.2",
+    "postcss-cli": "^6.1.3",
     "qunit": "^2.9.2",
-    "rollup": "^1.15.6",
-    "rollup-plugin-babel": "^4.3.2",
-    "rollup-plugin-node-resolve": "^5.0.3",
+    "rollup": "^1.17.0",
+    "rollup-plugin-babel": "^4.3.3",
+    "rollup-plugin-node-resolve": "^5.2.0",
     "shelljs": "^0.8.3",
     "shx": "^0.3.2",
     "sinon": "^7.3.2",
     "stylelint": "^10.1.0",
     "stylelint-config-twbs-bootstrap": "^0.3.1",
-    "terser": "^4.0.0",
+    "terser": "^4.1.2",
     "vnu-jar": "19.6.7"
   },
   "engines": {