remove unused default

fixes #36

Author: Greg Bowler

README.md

@@ -50,7 +50,7 @@ The following configuration options are available:
 + `configuration` Path to the `phpunit.xml` file (default: `test/phpunit/phpunit.xml`)
 + `log_junit` Path to junit output file (default: `test/phpunit/_junit/junit.xml`)
 + `memory_limit` The memory limit to run your tests with (default: `128M`)
-+ `bootstrap` The path to the bootstrap file (default: `vendor/autoload.php`)
++ `bootstrap` The path to the bootstrap file
 
 The syntax for passing in a custom input is the following: