Add aws cli rule

This rule corrects spelling mistakes for aws cli commands and
subcommands.

README.md

@@ -145,6 +145,7 @@ sudo -H pip install thefuck --upgrade
 The Fuck tries to match a rule for the previous command, creates a new command
 using the matched rule and runs it. Rules enabled by default are as follows:
 
+* `aws_cli` – fixes misspelled commands like `aws dynamdb scan`
 * `cargo` – runs `cargo build` instead of `cargo`;
 * `cargo_no_command` – fixes wrongs commands like `cargo buid`;
 * `cd_correction` – spellchecks and correct failed cd commands;