Update EnsembleLearnerCensusIncome.ipynb

Changed the VolumeSize to 20 GB from existing 1000 GB.

Author: roopeshranjan

introduction_to_applying_machine_learning/ensemble_modeling/EnsembleLearnerCensusIncome.ipynb

@@ -352,7 +352,7 @@
     "    \"ResourceConfig\": {\n",
     "        \"InstanceCount\": 1,\n",
     "        \"InstanceType\": \"ml.m4.4xlarge\",\n",
-    "        \"VolumeSizeInGB\": 1000\n",
+    "        \"VolumeSizeInGB\": 20\n",
     "    },\n",
     "    \"TrainingJobName\": job_name,\n",
     "    \"HyperParameters\": {\n",