Remove a Travis typo that causes expensive SageMaker & pyfunc tests t…

…o run twice (mlflow#1092)

Fixes a small typo in .travis.yml that slows down Python CI builds

.travis.yml

@@ -92,7 +92,7 @@ script:
   #   fi
   # Run tests that don't leverage specific ML frameworks
   - pytest --cov=mlflow --verbose --large --ignore=tests/h2o --ignore=tests/keras
-    --ignore=tests/pytorch --ignore=tests/pyfunc--ignore=tests/sagemaker --ignore=tests/sklearn
+    --ignore=tests/pytorch --ignore=tests/pyfunc --ignore=tests/sagemaker --ignore=tests/sklearn
     --ignore=tests/spark --ignore=tests/tensorflow
   # Run ML framework tests in their own Python processes. TODO: find a better method of isolating
   # tests.