Suggest ag -Q when relevant

This detects when `ag` suggests the `-Q` option, and adds it.

README.md

@@ -144,6 +144,7 @@ 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:
 
+* `ag_literal` – adds `-Q` to `ag` when suggested;
 * `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`;