Update Dockerfile

Author: ricoms

Dockerfile

@@ -3,14 +3,14 @@ LABEL maintainer="ricardosavii@gmail.com"
 
 # Install Ubuntu packages
 RUN apt-get update && apt-get install --no-install-recommends -y \
-        sudo=1.9.1-1 \
-        gdebi-core=0.9.5.7+nmu3 \
-        pandoc=2.5-3+b1 \
-        pandoc-citeproc=0.15.0.1-1+b5 \
-        libcurl4-gnutls-dev=7.68.0-1 \
+        sudo \
+        gdebi-core \
+        pandoc \
+        pandoc-citeproc \
+        libcurl4-gnutls-dev \
         libcairo2-dev/unstable \
-        libxt-dev=1:1.1.5-1+b3 \
-        libssl-dev=1.1.1g-1 \
+        libxt-dev \
+        libssl-dev \
     && VERSION=1.5.7.890 \
         && wget --no-verbose "https://s3.amazonaws.com/rstudio-shiny-server-os-build/ubuntu-12.04/x86_64/shiny-server-$VERSION-amd64.deb" -O ss-latest.deb \
         && gdebi -n ss-latest.deb \