Update README.md (#1110)

unterminated line causes errors in Dockerfile builds

Author: j-ro

containers/docker-from-docker-compose/README.md

@@ -53,7 +53,7 @@ You can adapt your own existing development container Dockerfile to support this
         && curl -fsSL https://download.docker.com/linux/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/gpg | apt-key add - 2>/dev/null \
         && echo "deb [arch=amd64] https://download.docker.com/linux/$(lsb_release -is | tr '[:upper:]' '[:lower:]') $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list \
         && apt-get update \
-        && apt-get install -y docker-ce-cli \
+        && apt-get install -y docker-ce-cli
 
     # Install Docker Compose
     RUN export LATEST_COMPOSE_VERSION=$(curl -sSL "https://api.github.com/repos/docker/compose/releases/latest" | grep -o -P '(?<="tag_name": ").+(?=")') \