#N/A: Add gem unknown command rule

README.md

@@ -164,6 +164,7 @@ using the matched rule and runs it. Rules enabled by default are as follows:
 * `fab_command_not_found` – fix misspelled fabric commands;
 * `fix_alt_space` – replaces Alt+Space with Space character;
 * `fix_file` – opens a file with an error in your `$EDITOR`;
+* `gem_unknown_command` – fixes wrong `gem` commands;
 * `git_add` – fixes *"pathspec 'foo' did not match any file(s) known to git."*;
 * `git_bisect_usage` – fixes `git bisect strt`, `git bisect goood`, `git bisect rset`, etc. when bisecting;
 * `git_branch_delete` – changes `git branch -d` to `git branch -D`;