misc. changes (check description)

rename SECONDS to SECONDS_LEFT, and add SECONDS.
add %rankup_rank_money_left_<rank>% placeholder
add permission requirement

src/main/java/sh/okx/rankup/requirements/requirement/GroupRequirement.java

@@ -5,8 +5,8 @@ import sh.okx.rankup.Rankup;
 import sh.okx.rankup.requirements.Requirement;
 
 public class GroupRequirement extends Requirement {
-  public GroupRequirement(Rankup plugin, String name) {
-    super(plugin, name);
+  public GroupRequirement(Rankup plugin) {
+    super(plugin, "group");
   }
 
   protected GroupRequirement(Requirement clone) {

src/main/java/sh/okx/rankup/requirements/requirement/MoneyRequirement.java

@@ -7,8 +7,8 @@ import sh.okx.rankup.requirements.DeductibleRequirement;
 import sh.okx.rankup.requirements.Requirement;
 
 public class MoneyRequirement extends DeductibleRequirement {
-  public MoneyRequirement(Rankup plugin, String name) {
-    super(plugin, name);
+  public MoneyRequirement(Rankup plugin) {
+    super(plugin, "money");
   }
 
   protected MoneyRequirement(Requirement clone) {

src/main/java/sh/okx/rankup/requirements/requirement/PermissionRequirement.java

@@ -0,0 +1,30 @@
+package sh.okx.rankup.requirements.requirement;
+
+import org.bukkit.entity.Player;
+import sh.okx.rankup.Rankup;
+import sh.okx.rankup.requirements.Requirement;
+
+public class PermissionRequirement extends Requirement {
+  public PermissionRequirement(Rankup plugin) {
+    super(plugin, "permission");
+  }
+
+  protected PermissionRequirement(Requirement clone) {
+    super(clone);
+  }
+
+  @Override
+  public boolean check(Player player) {
+    for(String permission : getValueString().split(" ")) {
+      if(!player.hasPermission(permission)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public Requirement clone() {
+    return new PermissionRequirement(this);
+  }
+}

src/main/java/sh/okx/rankup/requirements/requirement/PlaytimeMinutesRequirement.java

@@ -9,8 +9,8 @@ public class PlaytimeMinutesRequirement extends Requirement {
   private static final int TICKS_PER_MINUTE = 20 * 60;
   private Statistic playOneTick;
 
-  public PlaytimeMinutesRequirement(Rankup plugin, String name) {
-    super(plugin, name);
+  public PlaytimeMinutesRequirement(Rankup plugin) {
+    super(plugin, "playtime-minutes");
     try {
       playOneTick = Statistic.valueOf("PLAY_ONE_MINUTE");
     } catch (IllegalArgumentException e) {

src/main/java/sh/okx/rankup/requirements/requirement/XpLevelRequirement.java

@@ -6,8 +6,8 @@ import sh.okx.rankup.requirements.DeductibleRequirement;
 import sh.okx.rankup.requirements.Requirement;
 
 public class XpLevelRequirement extends DeductibleRequirement {
-  public XpLevelRequirement(Rankup plugin, String name) {
-    super(plugin, name);
+  public XpLevelRequirement(Rankup plugin) {
+    super(plugin, "xp-level");
   }
 
   protected XpLevelRequirement(Requirement clone) {