Release 1.2.0-beta1

• Fixes a race condition that caused when downloading multiple ranges of a file, these ranges overlapped so that a file was often downloaded multiple times in total (da44e8b)
• The default read-ahead size has been increased from 1 to 4MB and is now configurable with org.cryptomator.fusecloudaccess.readAheadBytes (a5f7253). Remember that it is a tradeoff between the amount of requests and their time consumption which has to be taken into account when adjusting this flag (a larger value results in less requests when e.g. downloading a large file, but also means that when streaming a video, for example, it may stall if it takes too long to load the next chunk).