updating stuff

assets/package.json

@@ -3,9 +3,9 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "react": "^16.2.0",
-    "react-dom": "^16.2.0",
-    "react-scripts": "1.1.1",
+    "react": "^16.9.0",
+    "react-dom": "^16.9.0",
+    "react-scripts": "^3.1.1",
     "sour-is": "file:src/vendor/sour-is"
   },
   "scripts": {
@@ -14,5 +14,17 @@
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject",
     "postinstall": "npm install src/vendor/sour-is"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
   }
 }