Merge pull request #1499 from arangodb/new_arangodb_version_2.8.4

Please upgrade to the ArangoDB Release 2.8.4

library/arangodb

@@ -10,6 +10,6 @@
 2.7: git://github.com/arangodb/arangodb-docker@dbfcc5f3edb37f622a2acd221b58106547b05fae jessie/2.7.5
 2.7.5: git://github.com/arangodb/arangodb-docker@dbfcc5f3edb37f622a2acd221b58106547b05fae jessie/2.7.5
 
-2.8: git://github.com/arangodb/arangodb-docker@017be97aab2b07352206d84241e4653dee38e456 jessie/2.8.3
-2.8.3: git://github.com/arangodb/arangodb-docker@017be97aab2b07352206d84241e4653dee38e456 jessie/2.8.3
-latest: git://github.com/arangodb/arangodb-docker@017be97aab2b07352206d84241e4653dee38e456 jessie/2.8.3
+2.8: git://github.com/arangodb/arangodb-docker@f6e00d9b7718ce51c32de062c09347192dc344ae jessie/2.8.4
+2.8.4: git://github.com/arangodb/arangodb-docker@f6e00d9b7718ce51c32de062c09347192dc344ae jessie/2.8.4
+latest: git://github.com/arangodb/arangodb-docker@f6e00d9b7718ce51c32de062c09347192dc344ae jessie/2.8.4