Describe supported Python version

.travis.yml

@@ -7,6 +7,8 @@ addons:
 language: python
 python:
   - "3.5"
+  - "3.6"
+  - "3.7"
 install:
   - pip install -r requirements.txt
   - pip install pycodestyle

docs/index.md

@@ -53,6 +53,10 @@ NetBox is built on the [Django](https://djangoproject.com/) Python framework and
 | Task queuing       | Redis/django-rq   |
 | Live device access | NAPALM            |
 
+## Supported Python Version
+
+NetBox supports Python 3.5, 3.6, and 3.7 environments currently. Python 3.5 is scheduled to be unsupported in NetBox v2.8.
+
 # Getting Started
 
 See the [installation guide](installation/index.md) for help getting NetBox up and running quickly.