fix travis pypy version, add python 3.7 to tests

Author: geraintpalmer

.travis.yml

@@ -2,7 +2,8 @@ language: python
 python:
   - 3.5
   - 3.6
-  - "pypy3.5"
+  - 3.7
+  - "pypy3"
 
 cache:
   directories:

README.rst

@@ -43,7 +43,8 @@ Current supported version of Python:
 
 - Python 3.5
 - Python 3.6
-- PyPy3.5
+- Python 3.7
+- PyPy3
 
 Usage
 -----

appveyor.yml

@@ -1,5 +1,6 @@
 environment:
   matrix:
+    - PYTHON: "C:\\Python37"
     - PYTHON: "C:\\Python36"
     - PYTHON: "C:\\Python35"
 install:

docs/index.rst

@@ -8,7 +8,7 @@ Ciw is a discrete event simulation library for open queueing networks.
 Its core features include the capability to simulate networks of queues, multiple customer classes, and implementation of Type I blocking for restricted networks.
 A number of other features are also implemented, including priorities, baulking, schedules, and deadlock detection.
 
-Please note that Ciw is currently supported for and regularly tested on Python versions 3.5 and 3.6.
+Please note that Ciw is currently supported for and regularly tested on Python versions 3.5, 3.6 and 3.7.
 
 Contents: