v1.2.0: Adding context version of Check and Response.Apply methods. (#8)

* Adding context version of Check and Response.Apply methods.
* Adding Go 1.10-1.11 + tip on Travis.
* Fixing Go versions on Travis.
* sdk test: fixing assertion.

v1.1.0

Merge branch 'master' of github.com:equinox-io/equinox

v1.0.0

Add a go.mod file