Update tox.ini to only assume Python 3.x instead of Python 3.4 specifically.

NEWS

@@ -2,6 +2,7 @@
  * Support for Borg --prefix option for consistency checks via "prefix" option in borgmatic's
    consistency configuration.
  * Add introductory screencast link to documentation.
+ * Update tox.ini to only assume Python 3.x instead of Python 3.4 specifically.
 
 1.1.15
  * Support for Borg BORG_PASSCOMMAND environment variable to read a password from an external file.

README.md

@@ -299,15 +299,22 @@ borgmatic to run.
 
 ## Running tests
 
-First install tox, which is used for setting up testing environments:
+First, clone a copy of [borgmatic source code](https://projects.torsion.org/witten/borgmatic):
 
 ```bash
-pip3 install tox
+git clone https://projects.torsion.org/witten/borgmatic
 ```
 
-Then, to actually run tests, run:
+Then, install tox, which is used for setting up testing environments:
 
 ```bash
+sudo pip3 install tox
+```
+
+Finally, to actually run tests, run:
+
+```bash
+cd borgmatic
 tox
 ```
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py34
+envlist=py3
 skipsdist=True
 
 [testenv]