Fix parsing of placeholder status

Fixes #341

core/src/main/java/com/github/games647/fastlogin/core/PremiumStatus.java

@@ -2,9 +2,19 @@ package com.github.games647.fastlogin.core;
 
 public enum PremiumStatus {
 
-    PREMIUM,
+    PREMIUM("Premium"),
 
-    CRACKED,
+    CRACKED("Cracked"),
 
-    UNKNOWN
+    UNKNOWN("Unknown");
+
+    private final String readableName;
+
+    PremiumStatus(String readableName) {
+        this.readableName = readableName;
+    }
+
+    public String getReadableName() {
+        return readableName;
+    }
 }

core/src/main/java/com/github/games647/fastlogin/core/RateLimiter.java

@@ -18,7 +18,7 @@ public class RateLimiter {
     /**
      * Ask if access is allowed. If so register the request.
      *
-     * @return true if allowed
+     * @return true if allowed - false otherwise without any side effects
      */
     public boolean tryAcquire() {
         // current time millis is not monotonic - it can jump back depending on user choice or NTP