reorder files and change circle instructions

circle.yml

@@ -1,6 +1,6 @@
 dependencies:
   pre:
-    - pip install -r requirements.txt
+    - pip install -r requirements-ci.txt
 
 test:
   override:
@@ -8,4 +8,4 @@ test:
   post:
     - mkdir -p $CIRCLE_ARTIFACTS/coverage
     - coverage html -d $CIRCLE_ARTIFACTS/coverage
-    - mv .coverage $CIRCLE_ARTIFACTS
+    - mv .coverage $CIRCLE_ARTIFACTS

requirements-ci.txt

@@ -0,0 +1,3 @@
+mock
+coverage
+

requirements-test.txt

@@ -1,2 +0,0 @@
-mock
-coverage