Lessen significance of browserslist

Adjust the default browsers to be a single list and remove it from the build output; it only affects CSS now

packages/react-scripts/package.json

@@ -80,17 +80,9 @@
   "optionalDependencies": {
     "fsevents": "1.2.4"
   },
-  "browserslist": {
-    "development": [
-      "last 2 chrome versions",
-      "last 2 firefox versions",
-      "last 2 edge versions"
-    ],
-    "production": [
-      ">1%",
-      "last 4 versions",
-      "Firefox ESR",
-      "not ie < 11"
-    ]
-  }
+  "browserslist": [
+    ">0.25%",
+    "not op_mini all",
+    "ie 11"
+  ]
 }

packages/react-scripts/scripts/build.js

@@ -41,7 +41,6 @@ const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
 const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
 const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
 const printBuildError = require('react-dev-utils/printBuildError');
-const { printBrowsers } = require('react-dev-utils/browsersHelper');
 
 const measureFileSizesBeforeBuild =
   FileSizeReporter.measureFileSizesBeforeBuild;
@@ -119,7 +118,6 @@ checkBrowsers(paths.appPath)
         buildFolder,
         useYarn
       );
-      printBrowsers(paths.appPath);
     },
     err => {
       console.log(chalk.red('Failed to compile.\n'));