Add compatible statsmodels version to environment.yml to fix CI ImportError

Author: sangampaudel530

AUTHORS.md

@@ -11,7 +11,7 @@
 
 * Copyright (c) 2011-2012, PyData Development Team
 
-  The PyData Development Team is the collection of developers of the PyData
+  The PyData Development Team is a collection of developers of the PyData
   project. This includes all PyData sub-projects, such as pandas. The
   core team that coordinates development on GitHub can be found here:
   [https://github.com/pydata](https://github.com/pydata).
@@ -22,13 +22,13 @@ Full credits for pandas contributors can be found in the documentation.
 
 PyData uses a shared copyright model. Each contributor maintains copyright
 over their contributions to PyData. However, it is important to note that
-these contributions are typically only changes to the repositories. Thus,
-the PyData source code in its entirety is not the copyright of any single
+these contributions are typically limited to changes to the repositories. Thus,
+the PyData source code, in its entirety, is not the copyright of any single
 person or institution. Instead, it is the collective copyright of the
 entire PyData Development Team.
 
-If individual contributors want to maintain a record of what changes/contributions they have specific copyright on,
-they should indicate this in the commit message when they commit the change
+If individual contributors want to maintain a record of the changes or contributions they hold specific copyright on,
+they should indicate this in the commit message when committing the change
 to one of the PyData repositories.
 
 With this in mind, the following banner should be used in any source code