Proper start command in docker file

Dockerfile

@@ -3,9 +3,9 @@ FROM ubuntu:16.04
 # Install dependencies
 RUN apt-get update --yes && apt-get upgrade --yes
 RUN apt-get install git nodejs npm \
-libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev libpng-dev build-essential g++ \
-ffmpeg \
-redis-server --yes
+    libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev libpng-dev build-essential g++ \
+    ffmpeg \
+    redis-server --yes
 
 RUN ln -s `which nodejs` /usr/bin/node
 
@@ -20,3 +20,6 @@ WORKDIR /home/audiogram/audiogram
 
 # Install dependencies
 RUN npm install
+
+
+CMD [ "npm", "start" ]