upgraded gradle version to 4.8
-rwxr-xr-x 1122 .gitignore
-rw-r--r-- 6 .ruby-version
-rw-r--r-- 1983 .travis.yml
-rw-r--r-- 542 DISCLAIMER
-rw-r--r-- 12533 LICENSE
-rw-r--r-- 178 NOTICE
-rwxr-xr-x 5878 README.md
-rw-r--r-- 1854 build.gradle
drwxr-xr-x - common
drwxr-xr-x - executor
drwxr-xr-x - gradle
-rwxr-xr-x 5242 gradlew
-rw-r--r-- 2260 gradlew.bat
drwxr-xr-x - leader
drwxr-xr-x - sdk
-rw-r--r-- 915 settings.gradle