update README to reflect change of dependencies

Author: ikirudennis

README.textile

@@ -9,7 +9,7 @@ h2. Installation
 @pip install textile@
 
 Dependencies:
-* "html5lib":https://pypi.org/project/html5lib/
+* "nh3":https://pypi.org/project/nh3/
 * "regex":https://pypi.org/project/regex/ (The regex package causes problems with PyPy, and is not installed as a dependency in such environments. If you are upgrading a textile install on PyPy which had regex previously included, you may need to uninstall it.)
 
 Optional dependencies include:

tests/fixtures/README.txt

@@ -10,7 +10,7 @@
 
 	<p>Dependencies:
 	<ul>
-		<li><a href="https://pypi.org/project/html5lib/">html5lib</a></li>
+		<li><a href="https://pypi.org/project/nh3/">nh3</a></li>
 		<li><a href="https://pypi.org/project/regex/">regex</a> (The regex package causes problems with PyPy, and is not installed as a dependency in such environments. If you are upgrading a textile install on PyPy which had regex previously included, you may need to uninstall it.)</li>
 	</ul></p>