Added a rule to delete sudo for pacaur. (#787)

thefuck/rules/unsudo.py

@@ -0,0 +1,15 @@
+patterns = ['you cannot perform this operation as root']
+
+
+def match(command):
+    if command.script_parts and command.script_parts[0] != 'sudo':
+        return False
+
+    for pattern in patterns:
+        if pattern in command.output.lower():
+            return True
+    return False
+
+
+def get_new_command(command):
+    return ' '.join(command.script_parts[1:])