219: Improve code coverage of ServiceProvider

Task-Url: #219

Author: keilw

docs/index.html

@@ -101,7 +101,7 @@ <h2>API</h2>
 	<pre><code>&lt;dependency&gt;
   &lt;groupId&gt;javax.measure&lt;/groupId&gt;
   &lt;artifactId&gt;unit-api&lt;/artifactId&gt;
-  &lt;version&gt;2.1.1&lt;/version&gt;
+  &lt;version&gt;2.1.2&lt;/version&gt;
 &lt;/dependency&gt;</code></pre>
 
 	For JSR 363 use <code>
@@ -110,10 +110,9 @@ <h2>API</h2>
 
 	<p>Further versions can be found <a href="http://mvnrepository.com/artifact/javax.measure/unit-api/" target="_blank">here</a>.</p>
 <p>
-Release artifacts should be accessible from the following repositories:
+Release artifacts are accessible from the following repositories:
 <ul>
 <li>Maven Central</li>
-<li>JCenter by Bintray</li>
 </ul>
 </p>