Update README.md (#5068)

Soulkey Kim · akarnokd · commit ad11100c1160 · 2017-02-04T08:34:09.000+01:00
* Update README.md

Error:(13, 38) java: variable v is already defined in method main(java.lang.String[])

* Update README.md
diff --git a/README.md b/README.md
@@ -128,7 +128,7 @@ Flowable.range(1, 10)
   .flatMap(v ->
       Flowable.just(v)
         .subscribeOn(Schedulers.computation())
-        .map(v -> v * v)
+        .map(w -> w * w)
   )
 .blockingSubscribe(System.out::println);
 ```

Original file line number	Diff line number	Diff line change
`@@ -128,7 +128,7 @@ Flowable.range(1, 10)`
`128`	`128`	`.flatMap(v ->`
`129`	`129`	`Flowable.just(v)`
`130`	`130`	`.subscribeOn(Schedulers.computation())`
`131`		`- .map(v -> v * v)`
	`131`	`+ .map(w -> w * w)`
`132`	`132`	`)`
`133`	`133`	`.blockingSubscribe(System.out::println);`
`134`	`134`	```