release v0.5.0 CI fixes (#251)

* fix Travis CI label in readme
* update earthdata login fixture for testing

Author: JessicaS11

README.rst

@@ -3,7 +3,7 @@ icepyx
 
 **Python tools for obtaining and working with ICESat-2 data**
 
-|Documentation Status|  |GitHub license|  |Travis CI Status| |Code Coverage| |Conda install| |Pypi install|
+|Documentation Status|  |GitHub license|  |Travis Dev Branch Build Status| |Code Coverage| |Conda install| |Pypi install|
 
 .. |Documentation Status| image:: https://readthedocs.org/projects/icepyx/badge/?version=latest
    :target: http://icepyx.readthedocs.io/?badge=latest

icepyx/tests/test_behind_NSIDC_API_login.py

@@ -17,9 +17,9 @@ def reg(scope="module"):
 
 @pytest.fixture
 def session(reg, scope="module"):
-    return Earthdata._start_session(
+    return Earthdata(
         "icepyx_devteam", "icepyx.dev@gmail.com", os.getenv("NSIDC_LOGIN")
-    )
+    )._start_session()
 
 
 ########## is2ref module ##########