switch to gradlew

README.md

@@ -8,15 +8,15 @@ The project is in development.  You can find technical documentation in the "doc
 
 ### Building
 
-You need Gradle and a JDK 8 or newer.  After installing those and setting up the appropriate paths, just type
+You need JDK 8 or newer.  After installing that and setting up the appropriate paths, just type
 
 ```
-gradle assemble 
+./gradlew assemble 
 ```
 
 If you want to run the unit tests, type
 ```
-gradle build
+./gradlew build
 ```
 
 Some of the UI tests will fail because they haven't been written yet :-/