refactor

README.md

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+# mdpatch
+
+Patch the frontmatter of markdown files
+
+# Usage
+```
+Usage: mdpatch [OPTIONS] <markdown>
+
+Arguments:
+  <markdown>  Markdown File
+
+Options:
+  -p, --patch <PATCH>       Apply JSON Patch file. If set to '-' read from stdin
+      --merge <FILE>        Merge Markdown frontmatter. If set to '-' read from stdin
+  -a, --add                 Only patch add operations
+  -m, --modify              Only patch modify operations
+  -d, --delete              Only patch delete operations
+  -v, --verbose             Print out what changes will be made to the document
+  -n, --dryrun              Dont modify the input file. Only print what would be done
+  -o, --output <OUTPUT>     Write patched file to output path. Dont modify the input file directly. If set to '-' output to stdout
+      --notest              Ignore tests in JSON Patch files
+  -x, --exclude <JSONPATH>  Exclude json path from patch
+  -k, --keys <JSONPATH>     Only include the specified json paths in patch
+```