Allow TypeScript 3 as a peer dependency

Author: nickserv

packages/react-scripts/package.json

@@ -32,7 +32,7 @@
     "dotenv-expand": "4.2.0",
     "extract-text-webpack-plugin": "3.0.2",
     "file-loader": "0.11.2",
-    "fork-ts-checker-webpack-plugin": "^0.2.8",
+    "fork-ts-checker-webpack-plugin": "^0.4.4",
     "fs-extra": "3.0.1",
     "html-webpack-plugin": "2.29.0",
     "jest": "22.4.2",
@@ -46,7 +46,7 @@
     "resolve": "1.6.0",
     "style-loader": "0.19.0",
     "sw-precache-webpack-plugin": "0.11.4",
-    "ts-jest": "22.0.1",
+    "ts-jest": "23.1.0",
     "ts-loader": "^2.3.7",
     "tsconfig-paths-webpack-plugin": "^2.0.0",
     "tslint": "^5.7.0",
@@ -62,10 +62,10 @@
   "devDependencies": {
     "react": "^15.5.4",
     "react-dom": "^15.5.4",
-    "typescript": "^2.7.1"
+    "typescript": "^3.0.1"
   },
   "peerDependencies": {
-    "typescript": "2.x"
+    "typescript": "2.x || 3.x"
   },
   "optionalDependencies": {
     "fsevents": "^1.1.3"