update README,CHANGES

Author: rolandrmgservices

CHANGES.md

@@ -2,14 +2,9 @@
 ## CentOS7 R 3.6.2 RStudio-Server 1.2.5033
 
 ```
-R_VERSION=3.6.2
+R_VERSION=4.0.3
 R_MAJOR_VERSION=`echo $R_VERSION | cut -d. -f1`
-RSTUDIO_VERSION=1.2.5033
-R_SHINY_SERVER_VERSION=1.5.12.933
-PYTHON3_VERSION=3.6.2
+RSTUDIO_VERSION=1.4.1103
+R_SHINY_SERVER_VERSION=1.5.16.958
+DOCKER_VERSION=5:20.10.3~3-0~ubuntu-focal
 ```
-
-- added README.md
-- added CHANGES.md
-- add R Shiny Server installation
-- add a Python 3 installation in `/usr/bin/python-$PYTHON3_VERSION`

README.md

@@ -1,10 +1,9 @@
 # Quickstart
 
-### Run install script as root on a clean CentOS 7 instance:
+### Run install script as root on a clean Ubuntu Focal 20.04 LTS instance:
 ```
-yum -y install git
 git clone git@github.com:ras44/rstudio-instance.git
 cd rstudio-instance
-git checkout linux-centos7
+git checkout linux-ubuntu-focal-20.04
 ./install.sh
 ```