Update cheatsheets

tldr/base64

@@ -12,6 +12,10 @@ source: https://github.com/tldr-pages/tldr.git
 
 `base64 {{path/to/file}}`
 
+- Wrap encoded output at a specific width (`0` disables wrapping):
+
+`base64 --wrap {{0|76|...}} {{path/to/file}}`
+
 - Decode the base64 contents of a file and write the result to `stdout`:
 
 `base64 --decode {{path/to/file}}`