Add git_two_dashes rule

README.md

@@ -167,6 +167,7 @@ using the matched rule and runs it. Rules enabled by default are as follows:
 * `git_push` – adds `--set-upstream origin $branch` to previous failed `git push`;
 * `git_push_pull` – runs `git pull` when `push` was rejected;
 * `git_stash` – stashes you local modifications before rebasing or switching branch;
+* `git_two_dashes` – adds a missing dash to commands like `git commit -amend` or `git rebase -continue`;
 * `go_run` – appends `.go` extension when compiling/running Go programs
 * `grep_recursive` – adds `-r` when you trying to `grep` directory;
 * `gulp_not_task` – fixes misspelled `gulp` tasks;