Changed dependencies from file to proper dependencies, also added flatDir to repository block.

build.gradle

@@ -31,6 +31,10 @@ repositories {
         name 'dmulloy2-repo'
         url 'http://repo.dmulloy2.net/content/groups/public/'
     }
+
+    flatDir {
+        dir 'libs'
+    }
 }
 
 task sourceJar(type: Jar, dependsOn: classes) {
@@ -95,10 +99,8 @@ file('libs').mkdirs()
 ant.get src: 'https://www.dropbox.com/s/1ofgubrldjwamnk/spigot.jar?dl=1', dest: file('libs'), verbose: false, skipexisting: true
 
 dependencies {
-    compile 'org.bukkit:bukkit:' + project.ext.spigotVersion
+    compile 'org.spigotmc:spigot-api:' + project.ext.spigotVersion
     compile 'com.comphenix.protocol:ProtocolLib:3.6.5-SNAPSHOT'
-    compile files(
-            'libs/spigot.jar'
-    )
+    compile name: 'spigot'
     testCompile group: 'junit', name: 'junit', version: '4.10'
 }

src/main/resources/plugin.yml

@@ -3,7 +3,7 @@ main: me.libraryaddict.disguise.LibsDisguises
 version: 8.6.8
 author: libraryaddict
 authors: [Byteflux, Navid K.]
-depend: [ProtocolLib]
+softdepend: [ProtocolLib]
 commands:
     libsdisguises:
       permission: libsdisguises.seecmd.libsdisguises