Release/3.0.7 (canvg#1241)

* v3.0.7

* docs

Merge pull request canvg#815 from canvg/v3.0.0

v3.0.0

Merge pull request canvg#761 from canvg/3.0.0-beta.0

3.0.0-beta.0

Merge pull request canvg#712 from canvg/2.0.0

2.0.0

Merge pull request canvg#689 from canvg/2.0.0-beta.1

2.0.0-beta.1

Merge pull request canvg#677 from canvg/prep_v2_beta

2.0.0-beta.0

Merge pull request canvg#644 from canvg/release_1_5_4

v1.5.4

Merge pull request canvg#622 from canvg/issue_342

Issue 342

Merge pull request canvg#601 from canvg/updating_docs_and_cdn

updating docs, cdn, fixing stackblur, 1.5.2

Merge pull request canvg#600 from canvg/v1.5.1

v1.5.1