ci: Travis: remove stages (#170)

Author: blueyed

.travis.yml

@@ -22,12 +22,10 @@ jobs:
     # - numpy
     # - verbose=0
     # - test_sys_breakpoint_interception (via pexpect).
-    - stage: baseline
-      env: TOXENV=py38-xdist
+    - env: TOXENV=py38-xdist
       python: '3.8'
 
-    - stage: tests
-      env:
+    - env:
         - TOXENV=py37-numpy-pexpect-twisted
         - PYTEST_ADDOPTS="-vv --showlocals --durations=50 --run-integration-tests"
       python: '3.7.4'