Winston loses Map and Set properties on meta

[robotmayo]

Example:

const myMeta = {istay: "a", iWillDissapear: new Map([["a","b"]])
winston.log("Some text", meta);
// outputs => Some Text {istay:"a", iWillDissapear: {}}

The cycle library as well as clone do not properly support maps and sets. Id recommend using lodash.clone or lodash.cloneDeep.

[maverick1872]

Introduced tests verifying this behavior functions as one would expect here: c4dd5ea

[maverick1872]

As it stands right now these tests are passing in the latest version as the tests above are defined. As such I'll be closing this issue.