Bump version to 1.3.0

[mickmister]

Summary

• [GH-44] Remove user-name option preview text #47
• Clarify that you can set channel welcome message & fix JSON indentation #60
• [GH-50] Added slash command autocomplete functionality #69
• Fixes /welcomebot preview teamname command not working. #74
• solves Gh 72 - Welcome bot will not let me add a message to private channels #79
• [mm-65] Allows users to add multiple teams to the messages using team-a,team-b in the messages #82
• Restrict channel invitations to non-guest accounts #90
• [MI-2731]:Added additional Loggings for fixing issue #97 #100
• Revert #82 and #79 #109

Ticket Link

[trilopin]

@mickmister note that lint is failing in CI

[DHaussermann]

I have done some testing on this release and there are issues:
1. The issue is fixed but, I can't make that work as a feature. It will just never welcome guests. Maybe I tried this wrong. @streamer45 maybe you have thoughts on this?
- Created a guest user and invited them to a team with working welcome message. When the new user logs in for the 1st time they don't get the bot DM even when I add the new field to my config

2. There's a feature where you can welcome multiple teams that does not work and should be reverted - [mm-65] Allows users to add multiple teams to the messages using team-a,team-b in the messages #82
3. Theres a feature where we add channel level welcome support to private channels that does not work and should be reverted - solves Gh 72 - Welcome bot will not let me add a message to private channels #79

@mickmister may be able to help on 2. and 3.

[DHaussermann]

@streamer45 disregard the comment above. This does work as expected. On some attempts to test I forgot to restart the server. And on the last attempt there was a syntax error (which you can even see in the screen shot 🙃)

[mickmister]

Created #109 to revert:

• [mm-65] Allows users to add multiple teams to the messages using team-a,team-b in the messages #82
• solves Gh 72 - Welcome bot will not let me add a message to private channels #79