v0.6.18

Changelog

f669c40 removed showAll from invite command
7cec509 adding invite link change
11cf6a9 finished invite link in cli
9f24f2c generates invite link
87d35bb first implementation of invite link
327a896 invite link works
78e5e4d remove brew formula
b0a72d9 move start validation forward and add else block for empty
cdb2e55 change wording in login to say welcome back
af2343d Update README.md