Update README.md

Author: mtumilowicz

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.com/mtumilowicz/kotlin-dsl-lambda-workshop.svg?branch=master)](https://travis-ci.com/mtumilowicz/kotlin-dsl-lambda-workshop)
+[![Build Status](https://app.travis-ci.com/mtumilowicz/kotlin-dsl-lambda-workshop.svg?branch=master)](https://travis-ci.com/mtumilowicz/kotlin-dsl-lambda-workshop)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 # kotlin-dsl-lambda-workshop
 
@@ -222,4 +222,4 @@ and the next
         * `map["key"] // map.get("key")`
     * lambda outside of parentheses
         * `file.use { it.read() } // file.use({ f -> f.read() } ) `
-    * lambda with a receiver
+    * lambda with a receiver