change blob to medium blob

src/main/java/net/tylermurphy/ken/database/StickerTable.java

@@ -19,7 +19,7 @@ public class StickerTable {
                 CREATE TABLE IF NOT EXISTS sticker_data (
                     guild_id BIGINT NOT NULL,
                     name VARCHAR(16) NOT NULL,
-                    image BLOB NOT NULL,
+                    image MEDIUMBLOB NOT NULL,
                     filename VARCHAR(50) NOT NULL,
                     PRIMARY KEY (guild_id,name)
                 );""";