History - Process Instance and Variable Instance

[sinhashubham95]

No description provided.

[sinhashubham95]

@liderman can you check this PR? I have added the implementations for history process and variable instance. Also made a few fixes in the external task.

[liderman]

All OK.
Later I will make a PR to replace "*[]string" with "[]string".
There is no point in using a pointer to slice.

[sinhashubham95]

Yeah @liderman I thought of making that change as well, but that will result in a lot of changes. If you want we can connect once and can quickly get this done and a few other refactoring also I had in mind.

[liderman]

@sinhashubham95 Ok. I was planning to release a major release "v3.0.0". Using go modules makes it safe.
I made a PR with the changes:
#33
If you want to make backward incompatible changes, you can submit a PR.
Let me know when you need to release "v3.0.0" and I'll tag it.

[sinhashubham95]

@liderman I also had changes to use context in mind. Give me some time mostly by the next weekend or the one after that I will make all the changes.

[liderman]

@sinhashubham95 Ok. No problem.
Thanks.