now group is common

TelegramBotAPI-extensions-api/build.gradle

@@ -18,7 +18,7 @@ plugins {
 }
 
 project.version = "$library_version"
-project.group = "com.github.insanusmokrassar"
+project.group = "$library_group"
 
 apply from: "publish.gradle"
 

TelegramBotAPI/build.gradle

@@ -18,7 +18,7 @@ plugins {
 }
 
 project.version = "$library_version"
-project.group = "com.github.insanusmokrassar"
+project.group = "$library_group"
 
 apply from: "publish.gradle"
 

gradle.properties

@@ -6,6 +6,7 @@ klock_version=1.8.7
 uuid_version=0.0.7
 ktor_version=1.3.1
 
+library_group=com.github.insanusmokrassar
 library_version=0.23.3
 
 gradle_bintray_plugin_version=1.8.4