included unzip in dockerfile

Dockerfile

@@ -9,7 +9,7 @@ FROM ubuntu
 # MAINTAINER name Chunteng Xiao
 RUN apt-get clean
 RUN apt-get update
-RUN apt-get -f install -y nodejs nginx npm curl
+RUN apt-get -f install -y nodejs nginx npm curl unzip
 RUN curl --insecure -o ./sonarscanner.zip -L https://sonarsource.bintray.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-3.2.0.1227-linux.zip
 RUN unzip sonarscanner.zip
 RUN rm sonarscanner.zip