Update zsh-autosuggestions submodule location

Thanks to @naibaf0. Closes #1096.

.gitmodules

@@ -1,3 +1,6 @@
+[submodule "modules/autosuggestions/external"]
+	path = modules/autosuggestions/external
+	url = https://github.com/zsh-users/zsh-autosuggestions
 [submodule "modules/history-substring-search/external"]
 	path = modules/history-substring-search/external
 	url = https://github.com/zsh-users/zsh-history-substring-search.git
@@ -16,6 +19,3 @@
 [submodule "modules/prompt/functions/pure"]
 	path = modules/prompt/external/pure
 	url = https://github.com/sindresorhus/pure.git
-[submodule "modules/autosuggestions/external"]
-	path = modules/autosuggestions/external
-	url = https://github.com/tarruda/zsh-autosuggestions