feat: automatically resolve non-absolute paths to files (cypress-io#189)

* feat: automatically try to resolve relative paths to files

* only save coverage file if it has been updated

fix: do not ask for backend code coverage from non-integration s… (cy…

…press-io#186)

fix: filtering against list of specs (cypress-io#182)

* fix: filtering against list of specs

* add example project with single spec selected

* update example

* add example to CI

* more coverage for one-spec

* lower backend example coverage limit

Removed Performance Warning, fixed by PR cypress-io#98 (cypress-io#178)

Removed Performance Warning, which was fixed by PR cypress-io#98

fix: better filtering of support files (cypress-io#177)

* add filtering example with support files

* working example

* run example job on CI

* start the server before testing

* update support file filtering

fix(deps): update dependency @cypress/browserify-preprocessor to v2.2.1

fix: update spec filter depending on the mask (cypress-io#173)

fix: improve spec filtering (cypress-io#171)

* fix: better unit coverage filter

* add to CI

* fix path

fix(deps): update dependency nyc to v15.0.1

feat: use `nyc` NPM dependency directly without bin executable (cypre…

…ss-io#162)

BREAKING CHANGE: `nyc` is no longer a peer dependency, instead
this module calls its API directly.

* use nyc as direct dependency

* feat: use nyc directly as a module

* skip binary install, close cypress-io#163

* hide CircleCI PR env variables

* add typescript example

* run ts-example server

* update README file

* use command

* feat: move istanbul-lib-coverage from peer to prod dependencies

* describe how to generate other reports

* add link to Docker example, close cypress-io#164