Update cheatsheets

cmatrix

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cmatrix
+
+> Shows a scrolling Matrix like screen in the terminal.
+> More information: <https://github.com/abishekvashok/cmatrix>.
+
+- Enable [a]synchronous scrolling:
+
+`cmatrix -a`
+
+- Change the text [C]olor (green by default):
+
+`cmatrix -C {{red}}`
+
+- Enable [r]ainbow mode:
+
+`cmatrix -r`
+
+- Use a screen [u]pdate delay of 100 centiseconds (1 second):
+
+`cmatrix -u 100`