Fixing golint and gofmt errors

[prateekpandey14]

This PR will fix golint and gofmt issues with all *.go files.
fixes #64
Use: golint and gofmt tool to fix the issue

[SendGridDX]

All committers have signed the CLA.

[leandro-lugaresi]

There is already an open PR (#121) to solve this issue

[thinkingserious]

Hi @prateekpandey14,

Thanks for the PR! As @leandro-lugaresi mentioned, this issue is address in PR #121.

I hope you will find another issue to take on for Hacktoberfest :)

With Best Regards,

Elmer

[prateekpandey14]

@leandro-lugaresi @thinkingserious
Other PR doesn't fix the golint issues with go files in examples and helpers directory.
they are only fixing gofmterrors.
can please verify the changes.

[mbernier]

@prateekpandey14, I have merged in the PRs that came previously. Can you please look into the merge conflicts and see if you have identified anything that hasn't already been covered? We would love to give you credit for the work you did here!

[mbernier]

Alrighty, I got everything merged - hopefully it builds with no issues!

[thinkingserious]

Hello @prateekpandey14,

Thanks again for the PR!

We want to show our appreciation by sending you some swag. Could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[prateekpandey14]

Thanks @thinkingserious @mbernier .
I have filled the details in above mentioned links.