change requirements (no more PySide2)

changed rfcat to no longer mandate python3

README.md

@@ -33,7 +33,8 @@ RfCat currently requires Python 2.7.  the only suspected incompatibilities with
 * libusb - should be able to work with either 1.x or 0.1 versions.  please let us know if you run into issues.
 * pyreadline (especially for Windows)
 * PySide2 (for Spectrum Analyzer GUI):  (Ubuntu 18.10+: python-pyside2)
-    $ sudo pip install PySide2
+    PySide2 is no longer installed automatically, due to support concerns for RPi platforms.  You can install it (if available for your platform) using pip:
+    $ sudo pip install PySide2  
 
 ### Build requirements
 

requirements.txt

@@ -1,4 +1,3 @@
-PySide2
 pyusb
 future
 ipython

rfcat

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 
 from __future__ import print_function
 

rflib/__init__.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env ipython3 -i --no-banner
+#!/usr/bin/env ipython -i --no-banner
 
 from __future__ import print_function
 from __future__ import absolute_import