🐛 FIX: Remove app.add_javascript use for sphinx v2

It is also available in sphinx 2

Author: chrisjsewell

sphinx_tabs/tabs.py

@@ -4,7 +4,7 @@
 import json
 import os
 import posixpath
-import sphinx
+
 from docutils import nodes
 from docutils.parsers.rst import Directive, directives
 from pkg_resources import resource_filename
@@ -347,11 +347,7 @@ def setup(app):
             if "add_script_file" in dir(app):
                 app.add_script_file(path)
             else:
-                # check sphinx version for backward compatibility
-                if sphinx.version_info >= (3, 0):
-                    app.add_js_file(path)
-                else:
-                    app.add_javascript(path)
+                app.add_js_file(path)
     app.connect("html-page-context", update_context)
     app.connect("build-finished", copy_assets)