Update NEWS with remove Python cache files before each Tox run.

NEWS

@@ -1,3 +1,6 @@
+1.3.6.dev0
+ * Remove Python cache files before each Tox run.
+
 1.3.5
  * #153: Support for various Borg directory environment variables (BORG_CONFIG_DIR, BORG_CACHE_DIR,
    etc.) via options in borgmatic's storage configuration.

setup.py

@@ -1,6 +1,6 @@
 from setuptools import find_packages, setup
 
-VERSION = '1.3.5'
+VERSION = '1.3.6.dev0'
 
 
 setup(