Minor improvements (fixes #20)

- update bstats
- add advancedachievements-achievement full name
- fix 1.8 compatibility
- add placeholder full name

build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 group 'sh.okx'
-version '3.5.6'
+version '3.5.7'
 
 repositories {
     mavenCentral()
@@ -29,7 +29,7 @@ repositories {
 
 dependencies {
     testCompile group: 'junit', name: 'junit', version: '4.12'
-    compile 'org.spigotmc:spigot-api:1.13.2-R0.1-SNAPSHOT'
+    compile 'org.spigotmc:spigot-api:1.14.4-R0.1-SNAPSHOT'
 
     compile('net.milkbowl.vault:VaultAPI:1.7') {
         exclude group: 'org.bukkit'