Increase version manually to 2.0.30-beta
Increase version manually to 2.0.30-beta

Something got wrong in the previous releases or bintray upload.

https://travis-ci.org/mockito/mockito#L270
:bintrayUpload FAILED`

https://travis-ci.org/mockito/mockito#L276

> Could not upload to 'https://api.bintray.com/content/szczepiq/maven/mockito/2.0.29-beta/org/mockito/mockito-core/2.0.29-beta/mockito-core-2.0.29-beta.jar': HTTP/1.1 409 Conflict [message:Unable to upload files: An artifact with the path 'org/mockito/mockito-core/2.0.29-beta/mockito-core-2.0.29-beta.jar' already exists]

smarkwell/mockito,TimvdLippe/mockito,windofthesky/mockito,terebesirobert/mockito,MuShiiii/mockito,stefanbirkner/mockito,icefoggy/mockito,rototor/mockito,mbrukman/mockito,mockito/mockito,ze-pequeno/mockito,Jazzepi/mockito,mohanaraosv/mockito,lukasz-szewc/mockito,zorosteven/mockito,bric3/mockito,Ariel-Isaacm/mockito,Jazzepi/mockito,LilaQin/mockito,TimvdLippe/mockito,ignaciotcrespo/mockito,diboy2/mockito,bric3/mockito,mohanaraosv/mockito,rototor/mockito,smarkwell/mockito,JeremybellEU/mockito,diboy2/mockito,ze-pequeno/mockito,hansjoachim/mockito,icefoggy/mockito,Jam71/mockito,mockito/mockito,mbrukman/mockito,MuShiiii/mockito,mockito/mockito,LilaQin/mockito,windofthesky/mockito,Ariel-Isaacm/mockito,lukasz-szewc/mockito,JeremybellEU/mockito,zorosteven/mockito,Jam71/mockito,ignaciotcrespo/mockito,bric3/mockito,hansjoachim/mockito,stefanbirkner/mockito