Feature/GitHub actions and clippy cleanup (#493)

* Added github actions templates

* removed travis .yml file

* initial clippy cleanup pass

* fixed the rest of clippy warnings

* Made github badges more fancy and consistent with the ones in sphinx

* Updated local rustc version and removed compilation warningns

* ... and fresh clippy warnings

* formatting

* beta clippy specific warnings fixed

* Fixed all nightly clippy warnings

* Fixed trying to unwrap a ()

* Actually running all tests

* Correctly passing the --all flag

* Hopefullly third time's a charm in fixing argument passing

README.md

@@ -11,7 +11,9 @@ The platform is composed of multiple Rust crates. Top-level executable binary cr
 * nym-network-monitor - sends packets through the full system to check that they are working as expected, and stores node uptime histories as the basis of a rewards system ("mixmining" or "proof-of-mixing").
 * nym-explorer - a (projected) block explorer and (existing) mixnet viewer. 
 
-[![Build Status](https://travis-ci.com/nymtech/nym.svg?branch=develop)](https://travis-ci.com/nymtech/nym)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg?style=for-the-badge)](https://opensource.org/licenses/Apache-2.0)
+[![Build Status](https://img.shields.io/github/workflow/status/nymtech/nym/Continuous%20integration/develop?style=for-the-badge&logo=github-actions)](https://github.com/nymtech/nym/actions?query=branch%3Adevelop)
+
 
 ### Building