Breaks when latest current directory is deleted

[black-snow]

Version: 0.3.2 (from brew cask info upterm - please add some version info to upterm itself)

When upterm's inside a dir that doesn't exist anymore you can't ssh (and probably some other commands fail, too).

Way to reproduce:

• Open upterm
• mkdir ~/somedir
• cd ~/somedir
• quit upterm
• remove ~/somedir
• open upterm
• ssh into some server

chdir(2) failed.: No such file or directory

Ain't no dealbreaker but quite confusing.