attempt #2 at scikit-image travisCI envs

.travis.yml

@@ -5,10 +5,9 @@ python:
   - "3.8"
 
 env:
-  - SKI=0.12
-  - SKI=0.14
-  - SKI=0.15
-  - SKI=0.16
+  - SKI=0.12.*
+  - SKI=0.14.*
+  - SKI=0.16.*
 
 sudo:
   false
@@ -40,7 +39,7 @@ install:
 #  # install deps
 #  - pip install pydicom coveralls watchdog requests jinja2 mpld3 click pyyaml tqdm==3.8
 
-  - pip install numpy scipy matplotlib pillow scikit-image==$SKI scikit-learn pydicom coveralls pyyaml yagmail tqdm reportlab
+  - pip install numpy scipy matplotlib pillow scikit-image==$SKI scikit-learn pydicom coveralls pyyaml yagmail tqdm reportlab cython
   # install your own package into the environment
   - python setup.py install
   # attempt to fix DISPLAY variable errors of matplotlib's. See: https://github.com/mwaskom/seaborn/pull/97