readthedocs Fix (#29)

* Replacing conda environment with RTD python

* Specifing python installation option for extra requirements.

* Triggering RTD

* Newline at end of file

readthedocs.yml

@@ -1,11 +1,17 @@
-build:
-  image: latest
+version: 2
 
-python:
-  version: 3.6
-
-conda:
-  file: environment.yml
+sphinx:
+  configuration: docs/conf.py
 
-formats: [htmlzip,epub]
+formats: 
+  - htmlzip
+  - epub
 
+python:
+  version: 3.6
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - testing
+  system_packages: true