Merge pull request #2590 from bagerard/update_readme_supported_db_Version

Update README with supported mongodb versions

Author: bagerard

README.rst

@@ -25,10 +25,10 @@ an `API reference <https://mongoengine-odm.readthedocs.io/apireference.html>`_.
 
 Supported MongoDB Versions
 ==========================
-MongoEngine is currently tested against MongoDB v3.4, v3.6 and v4.0. Future versions
+MongoEngine is currently tested against MongoDB v3.6, v4.0, v4.2 and v4.4. Future versions
 should be supported as well, but aren't actively tested at the moment. Make
 sure to open an issue or submit a pull request if you experience any problems
-with MongoDB version > 4.0.
+with a more recent MongoDB versions.
 
 Installation
 ============

docs/Makefile

@@ -27,6 +27,9 @@ help:
 	@echo "  linkcheck to check all external links for integrity"
 	@echo "  doctest   to run all doctests embedded in the documentation (if enabled)"
 
+install-deps:
+	-pip install -r requirements.txt
+
 clean:
 	-rm -rf $(BUILDDIR)/*