Fix bug in travis.yml (#1)

* Fix bug in travis.yml

* add codecov badge

* add python 3.7 to travis.ci

* Add python 3.7 travis image

* add download badge

.travis.yml

@@ -1,8 +1,10 @@
+dist: xenial   # required for Python >= 3.7
 language: python
 
 matrix:
   include:
     - python: "3.6"
+    - python: "3.7"
 
 before_install:
   - sudo apt-get update
@@ -35,7 +37,7 @@ install:
     cd -
 
 script:
-  - pytest --cov-config .coveragerc --cov yews --cov $YEWS_INSTALL_PATH test
+  - pytest --cov-config .coveragerc --cov yews --cov $YEWS_INSTALL_PATH tests
 
 after_success:
   # Necessary to run coverage combine to rewrite paths from

README.rst

@@ -6,7 +6,12 @@
 
 .. image:: https://travis-ci.org/lijunzh/yews.svg?branch=master
     :target: https://travis-ci.org/lijunzh/yews
-
+
+.. image:: https://codecov.io/gh/lijunzh/yews/branch/master/graph/badge.svg
+    :target: https://codecov.io/gh/lijunzh/yews
+
+.. image:: https://pepy.tech/badge/yews
+    :target: https://pepy.tech/project/yews
 
 Yews | Your Earthquake Waveform Solution
 ========================================