Fix syntax error

Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:trusty
 
 RUN apt-get update ;\
     apt-get install -y wget ;\
-    wget -O /tmp/plex.deb https://downloads.plex.tv/plex-media-server/1.3.3.3148-b38628e/plexmediaserver_1.3.3.3148-b38628e_amd64.deb
+    wget -O /tmp/plex.deb https://downloads.plex.tv/plex-media-server/1.3.3.3148-b38628e/plexmediaserver_1.3.3.3148-b38628e_amd64.deb ;\
     dpkg -i /tmp/plex.deb ;\
     rm -rf /tmp/plex.deb /var/lib/apt/lists/*