Update version number and update documentation
* Improve portability of `hostname` (#23)
* Fix incompatibilities between Cygwin and Git for Windows (#26)
* Allow Git program to be configured via yadm.git-program (#30)
* Support alt-links for encrypted files (#34)
* Exit with the same return value as Git (#35)
* Support spaces in alt-link paths (#36)
* Ignore empty lines in .yadm/encrypt (#40)
* Fix typos (#41)
Update version number and update documentation
* Improve portability of shebang line (#14)
* Support for symlinked directories (#17)
* Improve portability of tar parameters (#18)
* Support alternate gpg program (#19)
* Fallback to using `ls` if `/bin/ls` does not exist (#22)
Update version number and update documentation
* Support alternate paths for yadm data (#4, #5)
* Support asymmetric encryption (#7, #8)
* Prevent the mixing of output and gpg prompts
