Update cheatsheets

rapper

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rapper
+
+> The Raptor RDF parsing utility.
+> Part of the Raptor RDF Syntax Library.
+> More information: <http://librdf.org/raptor/rapper.html>.
+
+- Convert an RDF/XML document to Turtle:
+
+`rapper -i rdfxml -o turtle {{path/to/file}}`
+
+- Count the number of triples in a Turtle file:
+
+`rapper -i turtle -c {{path/to/file}}`