Update cheatsheets

ropper

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ropper
+
+> Find ROP gadgets in binary files.
+> More information: <http://scoding.de/ropper/>.
+
+- List gadgets in the binary file:
+
+`ropper --file {{path/to/binary}}`
+
+- Filter gadgets in the binary file by a regular expression:
+
+`ropper --file {{path/to/binary}} --search {{regex}}`
+
+- List gadgets of specified type in the binary file:
+
+`ropper --file {{path/to/binary}} --type {{rop|job|sys|all}}`
+
+- Exclude bad byte gadgets in the binary file:
+
+`ropper --file {{path/to/binary}} --badbytes {{byte_string}}`
+
+- List gadgets up to the specified instruction count in the binary file:
+
+`ropper --file {{path/to/binary}} --inst-count {{count}}`