Fixed up

Now doesn't accept special chars and added imgbot

src/main/java/me/mrCookieSlime/Slimefun/SlimefunPlugin.java

@@ -313,10 +313,8 @@ public final class SlimefunPlugin extends JavaPlugin {
 
 				for (Contributor contributor: utilities.contributors.values()) {
 					if (!contributor.hasTexture()) {
-						String name = contributor.getName();
-						
 						try {
-							Optional<UUID> uuid = MinecraftAccount.getUUID(name);
+							Optional<UUID> uuid = MinecraftAccount.getUUID(contributor.getMinecraftName());
 
 							if (uuid.isPresent()) {
 								Optional<String> skin = MinecraftAccount.getSkin(uuid.get());

src/main/java/me/mrCookieSlime/Slimefun/guides/GuideSettings.java

@@ -185,11 +185,13 @@ public final class GuideSettings {
 			try {
 				skull = CustomSkull.getItem(contributor.getTexture());
 			} catch (Exception e) {
-				Slimefun.getLogger().log(Level.SEVERE, "An Error occured while inserting a Contributors head.", e);
+				Slimefun.getLogger().log(Level.SEVERE, "An Error occurred while inserting a Contributors head.", e);
 			}
 
 			SkullMeta meta = (SkullMeta) skull.getItemMeta();
-			meta.setDisplayName(ChatColor.GRAY + contributor.getName());
+			meta.setDisplayName(ChatColor.GRAY + contributor.getName()
+					+ (!contributor.getName().equals(contributor.getMinecraftName()) ? " (MC: " + contributor.getMinecraftName() + ")" : "")
+			);
 			
 			List<String> lore = new LinkedList<>();
 			lore.add("");

src/main/java/me/mrCookieSlime/Slimefun/hooks/github/ContributionsConnector.java

@@ -1,23 +1,29 @@
 package me.mrCookieSlime.Slimefun.hooks.github;
 
-import java.util.Collections;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Pattern;
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 
 import me.mrCookieSlime.Slimefun.SlimefunPlugin;
-import org.bukkit.Bukkit;
 
 public class ContributionsConnector extends GitHubConnector {
 
+	private static final Pattern nameFormat = Pattern.compile("[\\w_]+");
+
 	// All names including "bot" are automatically blacklisted. But, others can be too right here.
 	// (includes "invalid-email-address" because it is an invalid contributor)
-	private static final List<String> blacklist = Collections.singletonList(
+	private static final List<String> blacklist = Arrays.asList(
-			"invalid-email-address"
+			"invalid-email-address",
+			"renovate-bot",
+			"ImgBotApp",
+			"TheBusyBot",
+			"imgbot"
 	);
 
 	// Matches a GitHub name with a Minecraft name.
@@ -66,7 +72,7 @@ public class ContributionsConnector extends GitHubConnector {
 	    	int commits = object.get("contributions").getAsInt();
 	    	String profile = object.get("html_url").getAsString();
 
-	    	if (!name.toLowerCase().contains("bot") && !blacklist.contains(name)) {
+	    	if (nameFormat.matcher(name).matches() && !blacklist.contains(name)) {
 	    		Contributor contributor = SlimefunPlugin.getUtilities().contributors.computeIfAbsent(
 	    				name,
 						key -> new Contributor(aliases.getOrDefault(name, name), profile)

src/main/java/me/mrCookieSlime/Slimefun/hooks/github/Contributor.java

@@ -14,14 +14,16 @@ public class Contributor {
 	
 	private static final String PLACEHOLDER_HEAD = "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNDZiYTYzMzQ0ZjQ5ZGQxYzRmNTQ4OGU5MjZiZjNkOWUyYjI5OTE2YTZjNTBkNjEwYmI0MGE1MjczZGM4YzgyIn19fQ==";
 
-	private String name;
+	private final String ghName;
-	private String profile;
+	private final String mcName;
-	private Optional<String> headTexture = Optional.empty();
+	private String profileLink;
+	private Optional<String> headTexture;
 	private final ConcurrentMap<String, Integer> contributions = new ConcurrentHashMap<>();
 
 	public Contributor(String name, String profile) {
-		this.name = name;
+		this.ghName = profile.substring(profile.lastIndexOf('/') + 1);
-		this.profile = profile;
+		this.mcName = name;
+		this.profileLink = profile;
 	}
 	
 	public void setContribution(String role, int commits) {
@@ -35,7 +37,16 @@ public class Contributor {
 	 * @since 4.1.13
 	 */
 	public String getName() {
-		return this.name;
+		return this.ghName;
+	}
+
+	/**
+	 * Returns the MC name of the contributor. This may be the same as {@link #getName()}.
+	 *
+	 * @return The MC username of this contributor.
+	 */
+	public String getMinecraftName() {
+		return this.mcName;
 	}
 
 	/**
@@ -45,7 +56,7 @@ public class Contributor {
 	 * @since 4.1.13
 	 */
 	public String getProfile() {
-		return this.profile;
+		return this.profileLink;
 	}
 	
 	public Map<String, Integer> getContributions() {
@@ -57,11 +68,16 @@ public class Contributor {
 	 * @return A Base64-Head Texture
 	 */
 	public String getTexture() {
-		return headTexture.orElse(PLACEHOLDER_HEAD);
+		if (headTexture == null || !headTexture.isPresent()) {
+			return PLACEHOLDER_HEAD;
+		}
+		else {
+			return headTexture.get();
+		}
 	}
 
 	public boolean hasTexture() {
-		return headTexture.isPresent();
+		return headTexture != null;
 	}
 
 	public void setTexture(Optional<String> skin) {