Update cheatsheets

pickle

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pickle
+
+> A PHP extension installer based on Composer.
+> More information: <https://github.com/FriendsOfPHP/pickle>.
+
+- Install a specific PHP extension:
+
+`pickle install {{extension_name}}`
+
+- Convert an existing PECL extension configuration to a Pickle configuration file:
+
+`pickle convert {{path/to/directory}}`
+
+- Validate a PECL extension:
+
+`pickle validate {{path/to/directory}}`
+
+- Package a PECL extension for release:
+
+`pickle release {{path/to/directory}}`