build: read version from MANIFEST

Author: iGabyTM

build.gradle.kts

@@ -17,6 +17,13 @@ dependencies {
 }
 
 tasks {
+    jar {
+        manifest {
+            attributes["Implementation-Title"] = "server"
+            attributes["Implementation-Version"] = project.version
+        }
+    }
+
     shadowJar {
         archiveFileName.set("PAPI-Expansion-Server-${project.version}.jar")
     }

src/main/java/at/helpch/placeholderapi/expansion/server/ServerExpansion.java

@@ -63,7 +63,7 @@ public final class ServerExpansion extends PlaceholderExpansion implements Cache
 
     @Override
     public @NotNull String getVersion() {
-        return "2.7.2";
+        return getClass().getPackage().getImplementationVersion();
     }
 
     @Override