Fixed plugin version unspecified error (#273)

Co-authored-by: Puneet Behl <[email protected]>

Author: rainboyan

build.gradle

@@ -9,6 +9,9 @@ buildscript {
     }
 }
 
+version project.projectVersion
+group "org.grails.plugins"
+
 apply plugin:"eclipse"
 apply plugin:"idea"
 apply plugin:"java-library"
@@ -18,9 +21,6 @@ apply plugin:"org.grails.grails-gsp"
 apply plugin: "org.asciidoctor.jvm.convert"
 apply plugin: "org.gradle.test-retry"
 
-version project.projectVersion
-group "org.grails.plugins"
-
 sourceCompatibility = 1.8
 targetCompatibility = 1.8