Fixes rgommezz#125, version bump

Prettier fixes + minor version bump

Adds ability to check for connectivity in background, defaults to fal…

…se (rgommezz#97)

Exporting checkInternetConnection for queries on demand + docs (rgomm…

…ezz#99)

Adds ability to check for connectivity in background, defaults to fal…

…se (rgommezz#97)

Version bump

Replaced fetch by promisified xmlhttprequest (rgommezz#61)

Added ability to check connectivity regularly (rgommezz#32)

Version bump

Checking for internet access (rgommezz#16)

Feature: Internet access detection:
- Extra step before reporting we are connected to avoid false positives
- Light HEAD ping request to a stable server as implementation
- Configurable ping server and timeout
- Update README.md to reflect new API