diff --git a/CHANGES.rst b/CHANGES.rst
index da26b9c..2b5c45c 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,4 +1,19 @@
+Release 0.3.0 (Dec 9, 2019)
+===========================
+
+* link line numbers to *.rst.txt
+
+
+
+Release 0.2.1 (May 28, 2019)
+============================
+
+* ...
+
+
+
 Version 0.1 (2014-12-10)
 ========================
 
 * Initial upload to PyPi
+
diff --git a/VERSION.txt b/VERSION.txt
new file mode 100644
index 0000000..993b933
--- /dev/null
+++ b/VERSION.txt
@@ -0,0 +1,9 @@
+0.3.0
+
+Update files:
+
+- VERSION.txt
+- setup.py
+- CHANGES.rst
+
+End.
\ No newline at end of file
diff --git a/setup.py b/setup.py
index d1f0d8b..2b4fca8 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from setuptools import setup, find_packages
 from codecs import open
 from os import path
@@ -14,7 +15,7 @@
     # Versions should comply with PEP440.  For a discussion on single-sourcing
     # the version across setup.py and the project code, see
     # https://packaging.python.org/en/latest/development.html#single-sourcing-the-version
-    version='0.1.0',
+    version='0.3.0',
 
     description='Implement Sphinx directive "ref-targets-list"',
     long_description=long_description,
diff --git a/sphinxcontrib/t3targets.py b/sphinxcontrib/t3targets.py
index a31c8a0..d51885e 100644
--- a/sphinxcontrib/t3targets.py
+++ b/sphinxcontrib/t3targets.py
@@ -12,6 +12,8 @@
 
 """
 
+from __future__ import absolute_import
+from six.moves import range
 __license__ = """
 
 If not otherwise noted, the extensions in this package are licensed
@@ -51,7 +53,11 @@
 #       http://nullege.com/codes/search/docutils.nodes.reference
 
 from docutils import nodes
-from sphinx.util.compat import Directive
+try:
+    from sphinx.util.compat import Directive
+except ImportError:
+    from docutils.parsers.rst import Directive
+
 from operator import itemgetter
 import os
 
@@ -65,7 +71,7 @@ def getRelPath(srcdir, destpath):
     # Starting from the filepath root, work out how much of the filepath is
     # shared by base and target.
     for i in range(min(len(srclist), len(destlist))):
-        if srclist[i] <> destlist[i]:
+        if srclist[i] != destlist[i]:
             break
     else:
         # If we broke out of the loop, i is pointing to the first differing
@@ -143,18 +149,18 @@ def process_reftargetslist_nodes(app, doctree, fromdocname):
             classes=['ref-targets-list'])
         labels = env.domains['std'].data['labels']
         anonlabels = env.domains['std'].data['anonlabels']
-        for doc in sorted(etc.keys(), key=keyfunc):
-            relpath = getRelPath(srcdir, doc).replace('\\','/')
+        for doc in sorted(list(etc.keys()), key=keyfunc):
+            relpath = getRelPath(srcdir, doc).replace('\\', '/')
             relpath = os.path.splitext(relpath)[0] + '.html'
             rstrelpath = os.path.join('_sources', doc)
-            rstrelpath = getRelPath(srcdir, rstrelpath).replace('\\','/')
-            rstrelpath = os.path.splitext(rstrelpath)[0] + '.txt'
+            rstrelpath = getRelPath(srcdir, rstrelpath).replace('\\', '/')
+            rstrelpath = os.path.splitext(rstrelpath)[0] + '.rst.txt'
             bullet_list = nodes.bullet_list(rawsource='', bullet='-')
             for lineno, refid in sorted(etc[doc], key=itemgetter(0)):
-                if labels.has_key(refid):
+                if refid in labels:
                     flag = 'label'
                     cntLabels += 1
-                elif anonlabels.has_key(refid):
+                elif refid in anonlabels:
                     flag = 'anonlabel'
                     cntAnonLabels += 1
                 else:
@@ -244,10 +250,10 @@ def doctreeRead(app, doctree):
     if not hasattr(env, 'ext_targets_cache'):
         env.ext_targets_cache = {}
     etc = env.ext_targets_cache
-    if not etc.has_key(docname):
+    if docname not in etc:
         etc[docname] = []
     for node in doctree.traverse(nodes.target):
-        if node.attributes.has_key('refid'):
+        if 'refid' in node.attributes:
             etc[docname].append((node.line, node.attributes['refid']))
 
 def setup(app):