Update README.md

Author: miho

README.md

@@ -43,7 +43,7 @@ Navigate to the [Gradle](http://www.gradle.org/) project (e.g., `path/to/JCSG`)
 
 #### Bash (Linux/OS X/Cygwin/other Unix-like shell)
 
-    sh gradlew assemble
+    bash gradlew assemble
 
 #### Windows (CMD)