Use pyproject for Travis

.travis.yml

@@ -12,10 +12,9 @@ before_install:
   - conda info -a
 
 install:
-  - conda create --name icepyx-env --channel conda-forge python=3.10 proj geos
+  - conda create --name icepyx-env --channel conda-forge python=3.10 pip proj geos
   - source activate icepyx-env
-  - pip install -r requirements.txt -r requirements-dev.txt
-  - pip install -e .[complete]
+  - pip install -e .[dev,complete]
 
 stages:
   - name: basic tests