Auto cleanup

Add auto clean up for old backups.

Introduced `shouldCleanUp` and `maxBackups` configuration options with corresponding default values.

fix backups stored in incorrect directory

v0.8.0

update readme

add custom configs flag

v0.7.0

Add ability to specify config name

v0.6.0: Merge pull request #3 from anytimesoon/fix-finding-execs

Fix url unsafe passwords

v0.5.0: Merge pull request #2 from anytimesoon/fix-finding-execs

Fix finding execs and exit if backup fails

v0.4.0: Merge pull request #1

* fix bug not finding executables

v0.3.0

add example config

v0.2.0

Update release.yml