SendGrid.CSharp.HTTP.Client 3.4.0

### Added - [PR #26](https://github.com/sendgrid/csharp-http-client/pull/26): Add a Code Of Conduct. Big thanks to [Henrik Bergqvist](https://github.com/hbbq) for the pull request! - [PR #31](https://github.com/sendgrid/csharp-http-client/pull/31): Update README.md - moved logo to top, added license and more badges. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #32](https://github.com/sendgrid/csharp-http-client/pull/32): Add more SEO Friendly Section links. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #28](https://github.com/sendgrid/csharp-http-client/pull/28): Add an example of displaying request headers on Client. Big thanks to [Richard D](https://github.com/dutts) for the pull request! - [PR #38](https://github.com/sendgrid/csharp-http-client/pull/38): Add GitHub PR template. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #52](https://github.com/sendgrid/csharp-http-client/pull/52): Added unittest to check for specific repo files. Big thanks to [Manjiri Tapaswi](https://github.com/mptap) for the pull request! - [PR #42](https://github.com/sendgrid/csharp-http-client/pull/42): Added example file, updated .gitignore and README.md. Big thanks to [Diego Rocha](https://github.com/dhsrocha) for the pull request! - [PR #43](https://github.com/sendgrid/csharp-http-client/pull/43): Add USAGE.md. Big thanks to [Rohit Daryanani](https://github.com/rohitdaryanani) for the pull request! - [PR #68](https://github.com/sendgrid/csharp-http-client/pull/68): Created a UseCases directory. Big thanks to [Ed Parry](https://github.com/ed-parry) for the pull request! - [PR #78](https://github.com/sendgrid/csharp-http-client/pull/78): Document new Git workflow. Big thanks to [Shivam Agarwal](https://github.com/gr8shivam) for the pull request! - [PR #74](https://github.com/sendgrid/csharp-http-client/pull/74): Add first-timers.md file for newcomers. Big thanks to [Ely Alamillo](https://github.com/ely-alamillo) for the pull request! - [PR #62](https://github.com/sendgrid/csharp-http-client/pull/62): Added CodeCov support. Big thanks to [Zac Marcus](https://github.com/ZacMarcus) for the pull request! - [PR #60](https://github.com/sendgrid/csharp-http-client/pull/60): Add Code Review to Contributing.md. Big thanks to [Derek Neuland](https://github.com/derekneuland) for the pull request! ### Fixed - [PR #24](https://github.com/sendgrid/csharp-http-client/pull/24): Typo in README.md. Big thanks to [Cícero Pablo](https://github.com/ciceropablo) for the pull request! - [PR #35](https://github.com/sendgrid/csharp-http-client/pull/35): Typo in CONTRIBUTING.md. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #49](https://github.com/sendgrid/csharp-http-client/pull/49): Update the LICENSE copyright year. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #50](https://github.com/sendgrid/csharp-http-client/pull/50): Update the LICENSE date range and add a unit test. Big thanks to [Dawid Treściński](https://github.com/blitzerpl) for the pull request! - [PR #53](https://github.com/sendgrid/csharp-http-client/pull/53): Make sure LICENSE file test works cross-platform. Big thanks to [Adlan Razalan](https://github.com/adlan) for the pull request! - [PR #65](https://github.com/sendgrid/csharp-http-client/pull/65): Update license year. Big thanks to [Alex](https://github.com/pushkyn) for the pull request! - [PR #85](https://github.com/sendgrid/csharp-http-client/pull/85): Fix test looking for LICENSE.txt. Big thanks to [Ashley Roach](https://github.com/aroach) for the pull request! - [PR #84](https://github.com/sendgrid/csharp-http-client/pull/84): Fix link to license in the README. Big thanks to [Pranjal Vyas](https://github.com/vyaspranjal33) for the pull request! - [PR #83](https://github.com/sendgrid/csharp-http-client/pull/83): Fix link to feature requests in the README. Big thanks to [Sanjay Singh](https://github.com/sanjaysingh) for the pull request! - [PR #82](https://github.com/sendgrid/csharp-http-client/pull/82): Fix location of LICENSE.md file. Big thanks to [Chandler Weiner](https://github.com/crweiner) for the pull request! - [PR #77](https://github.com/sendgrid/csharp-http-client/pull/77): Fix tests looking for wrong file type for License. Big thanks to [Anna](https://github.com/AnnaDodson) for the pull request! - [PR #70](https://github.com/sendgrid/csharp-http-client/pull/70): Corrected *.md files using Grammarly. Big thanks to [Alex](https://github.com/pushkyn) for the pull request!