Add Python3.7 and osx to CI

Author: willmcgugan

.travis.yml

@@ -3,21 +3,24 @@ language: python
 
 matrix:
   include:
-  - python: "2.7"
-    env: 
-      - SETUPTOOLS=setuptools PIP=pip
-  - python: "3.3"
-    env:
-      - SETUPTOOLS=setuptools~=39.2 PIP="pip<=18.0"
-  - python: "3.4"
-    env:
-      - SETUPTOOLS=setuptools PIP=pip
-  - python: "3.5"
-    env:
-      - SETUPTOOLS=setuptools PIP=pip
-  - python: "3.6"
-    env: 
-      - SETUPTOOLS=setuptools PIP=pip
+    - python: "2.7"
+      env:
+        - SETUPTOOLS=setuptools PIP=pip
+    - python: "3.3"
+      env:
+        - SETUPTOOLS=setuptools~=39.2 PIP="pip<=18.0"
+    - python: "3.4"
+      env:
+        - SETUPTOOLS=setuptools PIP=pip
+    - python: "3.5"
+      env:
+        - SETUPTOOLS=setuptools PIP=pip
+    - python: "3.6"
+      env:
+        - SETUPTOOLS=setuptools PIP=pip
+    - python: "3.7"
+      env:
+        - SETUPTOOLS=setuptools PIP=pip
 
 before_install:
   - pip install $SETUPTOOLS $PIP -U
@@ -36,7 +39,5 @@ script:
   - nosetests -v --with-coverage --cover-package=fs tests
 
 os:
-  - windows
   - linux
   - osx
-