Update Dockerfile

Author: rvmn

Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get install -y build-essential g++ curl libssl-dev apache2-utils git lib
 
 # Install Node.js
 RUN curl -sL https://deb.nodesource.com/setup | bash -
-RUN apt-get install -y nodejs
+RUN apt-get install -y nodejs software-properties-common htop
 
  # Install Java 8 & Maven
 RUN add-apt-repository ppa:webupd8team/java