docs: add v2.0 compatibility note
@@ -21,6 +21,14 @@ Resources
- PyPI: http://pypi.python.org/pypi/petl
- Conda Forge:https://anaconda.org/conda-forge/petl
+.. note::
+
+ - Version 2.0 will be a new major milestone of :mod:`petl`.
+ - This version will introduce some changes that could affect current behaviour.
+ - We will try to keep compatibility to maximum, except where it is inconsistent.
+ - The biggest change is the end of support of Python `2.7`.
+ - The minimum supported version will be Python `3.6`.
+
Getting Help
-------------
