Release: 384.10_2-gnuton4

Changes from the latest stable gnuton build (384.10_2-gnuton3):

• build: circleci: cleaning up the lines which generate changelogs from git log
• build: circleci: use circle_tag as current tag when extracting changelogs
• build: circleci: parametrized changelog file path
• build: circleci: fixed typo