Update build.gradle
Update build.gradle

set gradle plugin according to the AS = Version 3.4.2
cgeo/cgeo,auricgoldfinger/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,tobiasge/cgeo,cgeo/cgeo,S-Bartfast/cgeo,S-Bartfast/cgeo,matej116/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,matej116/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,S-Bartfast/cgeo,cgeo/cgeo,matej116/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo