v1.3.0: Great Go Graphs

We've completely revamped the /jetze command, and it now gives users more information than just the latest report. Is the queue length trending up? Down? Now you'll know!

• /jetzte now reports the queue length with a graph displaying all reports for the last half hour
• The bot will now show a "sending image" indicator during long operations
• We've added a development flag for ease of development
• Refactors, for future ease of development
• Typo and bug fixes
• Did I mention how not-really-good the data visualization libraries in go are?