Edited narrative on running unit tests.

Author: weierophinney

README.md

@@ -31,24 +31,26 @@ interfaces.
 
 ## Running Unit Tests
 
-To run the supplied skeleton unit tests, need to either choose to install
-MVC testing support during project creation, or to add [zend-test](https://zendframework.github.io/zend-test/)
-as a development dependency with
+To run the supplied skeleton unit tests, you need to do one of the following:
 
-```bash
-$ composer require --dev zendframework/zend-test
-```
+- During initial project creation, select to install the MVC testing support.
+- After initial project creation, install [zend-test](https://zendframework.github.io/zend-test/):
 
-Once installed, you can run the tests using:
+  ```bash
+  $ composer require --dev zendframework/zend-test
+  ```
+
+Once testing support is present, you can run the tests using:
 
 ```bash
 $ ./vendor/bin/phpunit
 ```
 
-If you need to make local modifications to phpunit xml configuration file,
-copy `phpunit.xml.dist` to `phpunit.xml`, which will take precedence by the test runner
- and is ignored by the repository.
-
+If you need to make local modifications for the PHPUnit test setup, copy
+`phpunit.xml.dist` to `phpunit.xml` and edit the new file; the latter has
+precedence over the former when running tests, and is ignored by version
+control. (If you want to make the modifications permanent, edit the
+`phpunit.xml.dist` file.)
 
 ## Using Vagrant