Update README.md

browsers/node12.14.1-chrome83-ff77/README.md

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 # cypress/browsers:node12.14.1-chrome83-ff77
 
 A complete image with all operating system dependencies for Cypress, Chrome
-81 and Firefox 75 browsers.
+83 and Firefox 77 browsers.
 
 [Dockerfile](Dockerfile)
 
-```text
-node version:    v12.14.1
-npm version:     6.14.4
-yarn version:    1.22.4
-debian version:  10.1
-Chrome version:  Google Chrome 83.0.4103.61
-Firefox version: Mozilla Firefox 77.0
-git version:     git version 2.20.1
+```
+ node version:    v12.14.1
+ npm version:     6.14.5
+ yarn version:    1.22.4
+ debian version:  10.2
+ Chrome version:  Google Chrome 83.0.4103.61
+ Firefox version: Mozilla Firefox 77.0
+ git version:     git version 2.20.1
+ whoami:          root
 ```
 
 **Note:** this image uses the `root` user. You might want to switch to non-root