version bump, custom docsets

[Yanpas]

fixes #25

I've added this settings for test:

"dash.custom_docsets": {
        "gdscript" : ["godot"],
        "cmake": "cmake"
    }

Maybe we should switch from language id to file extensions, don't know

[coveralls]

Coverage remained the same at 100.0% when pulling a9ff3fa on Yanpas:custom_docsets into 550eda1 on deerawan:master.

[deerawan]

@Yanpas I opened this PR #38, most likely will also solve same issue, would mind checking on it? Thank you

[Yanpas]

yes, it solves!

[deerawan]

@Yanpas cool 👍