Merge pull request #43 from aws-samples/fixes

updated boto3 isntallation requirement

Author: emerson131

Dockerfile

@@ -22,7 +22,7 @@ RUN yum update -y && \
     yum -y install yum-plugin-versionlock && \
     yum -y versionlock add java-1.8.0-openjdk-1.8.0.362.b08-0.amzn2.0.1.x86_64 && \
     yum -y install java-1.8.0-openjdk && \
-    pip install --upgrade pip && \
+    pip install --upgrade pip && pip install boto3 && \
     pip install pyspark==$PYSPARK_VERSION && \
     yum clean all