Update cheatsheets

gulp

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gulp
+
+> JavaScript task runner and streaming build system.
+> Tasks are defined within `gulpfile.js` at the project root.
+> More information: <https://github.com/gulpjs/gulp-cli>.
+
+- Run the default task:
+
+`gulp`
+
+- Run individual tasks:
+
+`gulp {{task}} {{othertask}}`
+
+- Print the task dependency tree for the loaded gulpfile:
+
+`gulp --tasks`