[#1019] Add codecov file to control limits for passing (#1021)

* Remove numpy restriction

Bug fixed

* Upgrade pip

* Remove specific version of flake8

'\' in comments now need to be escaped

* Add basepython section

* Try using pypy3.5

* Go back to pypy3 and remove basepython block

* Don't need to run build_test for all builds - only 3.6

* Remove warning from coverage

* Undo previous change

* Try disabling faulthandler

* Remove --no-faulthandler

* pypy needs an older version of pytest

See pytest-dev/pytest#5807

* Use platform_python_implementation since implementation_name is not defined on Python2

* Try to get back to the initial coverage

* Do the same thing for build_test

* Remove redundant pip

* Add codecov file to try to control limits for passing

.codecov.yml

@@ -0,0 +1,14 @@
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+
+  status:
+    project:
+      default:
+        threshhold: 5%
+    patch:
+      default:
+        threshhold: 5%
+
+