Update cheatsheets

cowsay

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cowsay
+
+> Print ASCII art (by default a cow) saying or thinking something.
+> More information: <https://github.com/tnalpgge/rank-amateur-cowsay>.
+
+- Print an ASCII cow saying "hello, world":
+
+`cowsay "{{hello, world}}"`
+
+- Print an ASCII cow saying text from `stdin`:
+
+`echo "{{hello, world}}" | cowsay`
+
+- List all available art types:
+
+`cowsay -l`
+
+- Print the specified ASCII art saying "hello, world":
+
+`cowsay -f {{art}} "{{hello, world}}"`
+
+- Print a dead thinking ASCII cow:
+
+`cowthink -d "{{I'm just a cow, not a great thinker...}}"`
+
+- Print an ASCII cow with custom eyes saying "hello, world":
+
+`cowsay -e {{characters}} "{{hello, world}}"`