Makes sure tab completed paid sign names are quoted

src/main/java/net/knarcraft/paidsigns/utility/TabCompleteHelper.java

@@ -4,6 +4,7 @@ import net.knarcraft.paidsigns.PaidSigns;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 /**
  * A helper class for providing common tab complete options
@@ -43,7 +44,12 @@ public final class TabCompleteHelper {
      * @return <p>The names of all registered paid signs</p>
      */
     public static List<String> getPaidSignNames() {
-        return new ArrayList<>(PaidSigns.getInstance().getSignManager().getAllPaidSigns().keySet());
+        Set<String> paidSignNames = PaidSigns.getInstance().getSignManager().getAllPaidSigns().keySet();
+        List<String> quotedNames = new ArrayList<>(paidSignNames.size());
+        for (String paidSignName : paidSignNames) {
+            quotedNames.add("\"" + paidSignName + "\"");
+        }
+        return new ArrayList<>(quotedNames);
     }
 
     /**