Add codecov configuration

.codecov.yml

@@ -0,0 +1,31 @@
+codecov:
+  branch: master
+
+coverage:
+  precision: 2
+  round: down
+  range: 60...100
+
+  status:
+    project:
+      default:
+        enabled: yes
+        target: auto
+        if_no_uploads: error
+        if_ci_failed: error
+
+    patch:
+      default:
+        enabled: yes
+        target: 80%
+        threshold: 60%
+        if_no_uploads: error
+        if_ci_failed: error
+
+    changes:
+      default:
+        enabled: yes
+        if_no_uploads: error
+        if_ci_failed: error
+
+comment: false

.travis.yml

@@ -22,7 +22,7 @@ matrix:
       - env: TOXENV=flake8
       - env: DRF=master
       - python: '2.7'
-      - python: '3.7'
+      - python: '3.7-dev'
 
 install:
  - pip install -r requirements/ci.txt