set version to 1.2.0

Author: bcorne

sources/build.gradle

@@ -22,7 +22,7 @@ apply from: project.rootProject.file("gradle/scripts/coverage.gradle")
 
 group = 'com.ullink.slack'
 archivesBaseName = 'simpleslackapi'
-version = '1.2.0-SNAPSHOT'
+version = '1.2.0'
 
 
 def pomConfig = {