updated the post_bug fucntion and added testcases to test post_bug fu…

[kpiyush04]

1. Updated the post_bug function in the post_bug.R file where the user can interactively report the bugs from the console.
2. Added test cases to test the post_bug function in the console to interact with the menu().
3. Removed the jsonlite and reshape2 dependencies as they as no longer required.

issue: #4

[llrs]

You do not need to finish this for next week, focus on the visualization of the database but I leave these comments of what we talked so that you can refer to them later and learn from them.

[llrs]

The post requests is not using the header defined on the package. Use .state$headers.
But do not continue working on this for now. Focus on the R bugzilla database exploration.

[llrs]

It's been a while I've haven't heard from you. I'm closing as I've worked on the other #9 PR, but if you want to continue working on the package do not hesitate to do so!
Hope the university and the internship is going great!