Add missing built-in constants

#2

Fix typo

#1

Completions include 'gl.' when complete typing.

Sorry for misunderstood the semver concept.
v1.1.0 is now become v2.0.0, because it has a breaking change.

WebGL Completions for Sublime Text

type 'gl.' then you can see WebGL completion exclude 'gl.' like 'createBuffer()' .