Use MessageAnnotation for span.log

This changes the behaviour of span.log slightly as to be seen in #103

If you want the same behaviour as before you need to migrate your span.log usage like this:

// before 3.0

cy.log({foo: "bar", one: "two"})

// after 3.0

cy.setTag("foo", "bar");
cy.setTag("one", "two");

Thank you @ashishmahi for sending in the PR 💯

v2.1.0

• chore: update package lock 6e72d41
• Support OpenTracing span.context() (#100) e5525c6
• fix(license): copy paste copyright notice issue (#97) 04b5f3a
• chore(deps): update dependency cypress to v3 (#64) 9488588
• chore(license): add standard MIT license (#94) 1d22ebe

v2.0.1...v2.1.0

v2.0.1

• fix: pass sampler to Tracer instead of SpanCreator 5e09f87

v2.0.0...v2.0.1

Thank you @koenpunt

v1.6.0

Allow arbitrarily named tags