docs: add Angamanga as a contributor

[allcontributors]

Adds @Angamanga as a contributor for doc, code, bug, review, tutorial, ideas.

This was requested by rowasc in this comment

[ushbot]

Hey @allcontributors[bot],
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[allcontributors]

@ushbot

I could not determine your intention.

Basic usage: @all-contributors please add @jakebolam for code, doc and infra

For other usages see the documentation

[coveralls]

Coverage remained the same at 20.526% when pulling 659d720 on all-contributors/add-Angamanga into 2515ba7 on develop.

[rowasc]

[clabot:check]

[ushbot]

It looks like @allcontributors[bot] hasn't signed our Contributor License Agreement, yet.

Appreciation of efforts,

clabot

[allcontributors]

@ushbot

I could not determine your intention.

Basic usage: @all-contributors please add @jakebolam for code, doc and infra

For other usages see the documentation

[rowasc]

[clabot:check]

[ushbot]

It looks like @allcontributors[bot] hasn't signed our Contributor License Agreement, yet.

Appreciation of efforts,

clabot

[allcontributors]

@ushbot

I could not determine your intention.

Basic usage: @all-contributors please add @jakebolam for code, doc and infra

For other usages see the documentation

[rowasc]

[clabot:check]

[ushbot]

@rjmackay It looks like @allcontributors[bot] just signed our Contributor License Agreement. 👍

Always at your service,

clabot

[allcontributors]

@ushbot

I could not determine your intention.

Basic usage: @all-contributors please add @jakebolam for code, doc and infra

For other usages see the documentation