📚 Advise on using a venv

Also bumps the dev version.

README.md

@@ -23,6 +23,11 @@ These recipes are not ported to the new toolchain yet:
 
 ## Installation & requirements
 
+Before we start, we strongly advise to use a Python virtual environment to install Python packages.
+
+      python3 -m venv venv
+      . venv/bin/activate
+
 Install [Kivy for iOS from PyPI](https://pypi.org/project/kivy-ios) with pip like any Python package.
 
       pip3 install kivy-ios

setup.py

@@ -16,7 +16,7 @@ def recursive_include(module):
 
 setup(
     name="kivy-ios",
-    version="1.1.2",
+    version="1.1.2.dev0",
     description="Kivy for iOS",
     long_description=read("README.md"),
     long_description_content_type="text/markdown",