vsgCs v1.1.0 released.

[timoore]

I've just tagged version 1.1.0 of vsgCs. Major changes since v1.1.0:

• vsgCs now uses Cesium Native v0.48.0.
• Many more raster overlay sources are supported: TMS, WMS, WMTS, and generic URLs with templates. Contributed by @chengdz.

I've just noticed a typo in the CHANGES.md file and will be releasing v1.1.1 momentarily.