Update cheatsheets

airpaste

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# airpaste
+
+> Share messages and files on the same network using mDNS.
+> More information: <https://github.com/mafintosh/airpaste>.
+
+- Wait for a message and display it when received:
+
+`airpaste`
+
+- Send text:
+
+`echo {{text}} | airpaste`
+
+- Send a file:
+
+`airpaste < {{path/to/file}}`
+
+- Receive a file:
+
+`airpaste > {{path/to/file}}`
+
+- Create or join a channel:
+
+`airpaste {{channel_name}}`