Fix error about dynamic import

Explanation: microsoft/TypeScript#16675

README.md

@@ -1,13 +1,3 @@
-### Typescript dynamic import
+### Typescript dynamic import example
 
-I get error `Dynamic import cannot be used when targeting ECMAScript 2015 modules.`
-when I try to use dynamic import inside typescript project with `"module": "es2015"`
-in configuration. The error message makes it clear that I can't use `import()` with
-es modules but it doesn't make sense because `import()` is part of es modules.  
-
-However, it compiles correctly but throw annoing error.
-
-You can check typescript output by running `npm run build-ts`. Compiled files
-will be in `build/` folder.
-And also you can check that webpack process it correctly by running `npm run build-webpack`
-and opening `index.html`
+See source code

tsconfig.json

@@ -7,7 +7,7 @@
       "es2015.promise"
     ],
     "moduleResolution": "node",
-    "module": "es2015",
+    "module": "esnext",
     "noFallthroughCasesInSwitch": true,
     "noImplicitAny": true,
     "noUnusedLocals": true,