No longer test for Python 3.4 on macOS

numpy and pandas install slowly on Python 3.4.  Instead of writing the if/then logic to only install those on Python 3.5 or newer, just test on Python 3.5 or newer on macOS in order to speed up the Azure Pipeline build.

Author: Todd Leonhardt

azure-pipelines.yml

@@ -14,16 +14,14 @@ jobs:
   # Run the pipeline with multiple Python versions
   strategy:
     matrix:
-      Python34:
-        python.version: '3.4'
       Python35:
         python.version: '3.5'
       Python36:
         python.version: '3.6'
       Python37:
         python.version: '3.7'
     # Increase the maxParallel value to simultaneously run the job for all versions in the matrix (max 10 for free open-source)
-    maxParallel: 4
+    maxParallel: 3
 
   steps:
     # Set the UsePythonVersion task to reference the matrix variable for its Python version