- npm: Update devDeps

- Build: Switch to `terser` plugin with `uglify` plugin not
    supporting ES6+-capable minifier
- Linting (ESLint): Consistent curly spacing; follow new "standard"

package.json

@@ -58,13 +58,13 @@
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.7.0",
-    "eslint": "4.19.1",
-    "eslint-config-standard": "11.0.0",
-    "eslint-plugin-import": "2.13.0",
-    "eslint-plugin-node": "6.0.1",
-    "eslint-plugin-promise": "3.8.0",
-    "eslint-plugin-qunit": "^3.2.1",
-    "eslint-plugin-standard": "3.1.0",
+    "eslint": "5.5.0",
+    "eslint-config-standard": "12.0.0",
+    "eslint-plugin-import": "2.14.0",
+    "eslint-plugin-node": "7.0.1",
+    "eslint-plugin-promise": "4.0.0",
+    "eslint-plugin-qunit": "^3.3.1",
+    "eslint-plugin-standard": "4.0.0",
     "find-in-files": "^0.5.0",
     "imageoptim-cli": "^2.0.3",
     "jsdoc": "^3.5.5",
@@ -72,17 +72,16 @@
     "node-static": "^0.7.10",
     "opn-cli": "^3.1.0",
     "promise-fs": "^1.3.0",
-    "qunit": "^2.6.1",
-    "rollup": "0.63.2",
+    "qunit": "^2.6.2",
+    "rollup": "0.65.2",
     "rollup-plugin-babel": "^3.0.7",
-    "rollup-plugin-commonjs": "^9.1.3",
+    "rollup-plugin-commonjs": "^9.1.6",
     "rollup-plugin-json": "^3.0.0",
     "rollup-plugin-node-builtins": "^2.1.2",
-    "rollup-plugin-node-resolve": "^3.3.0",
+    "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-re": "^1.0.7",
-    "rollup-plugin-uglify": "^4.0.0",
-    "sinon": "^6.1.3",
-    "sinon-test": "^2.3.0",
-    "uglify-es": "^3.3.9"
+    "rollup-plugin-terser": "^2.0.2",
+    "sinon": "^6.2.0",
+    "sinon-test": "^2.3.0"
   }
 }