update crate status (#450)

Author: Byron

README.md

@@ -132,6 +132,7 @@ is usable to some extend.
   * [git-repository](https://github.com/Byron/gitoxide/blob/main/crate-status.md#git-repository)
   * [git-attributes](https://github.com/Byron/gitoxide/blob/main/crate-status.md#git-attributes)
   * [git-pathspec](https://github.com/Byron/gitoxide/blob/main/crate-status.md#git-pathspec)
+  * [git-refspec](https://github.com/Byron/gitoxide/blob/main/crate-status.md#git-refspec)
   * `gitoxide-core`
 * **very early**  _(possibly without any documentation and many rough edges)_
   * [git-index](https://github.com/Byron/gitoxide/blob/main/crate-status.md#git-index)

crate-status.md

@@ -232,7 +232,11 @@ Check out the [performance discussion][git-traverse-performance] as well.
 
 ### git-pathspec
 * [x] parse
-* [ ] check for match
+* [ ] matching of paths
+
+### git-refspec
+* [x] parse
+* [ ] matching of references and object names
 
 ### git-note