Gradle specification

[ArcherN9]

I've added a line for those who want to use the library using a gradle system. A little extra information never hurt anyone!

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This change is 

[0x3333]

Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion.

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README.md, line 39 at r1 (raw file):

Alternatively, if you use gradle or are on android, add the following to your app's build.gradle file under dependencies:

Could you add a backtick in build.gradle, like build.gradle?

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[0x3333]

Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion.

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README.md, line 39 at r1 (raw file):

Previously, 0x3333 (Tercio Gaudencio Filho) wrote…

Could you add a backtick in build.gradle, like `build.gradle`?

`build.gradle`

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Comments from Reviewable

[0x3333]

Reviewed 1 of 1 files at r1. Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion.

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Comments from Reviewable

[0x3333]

Reviewed 1 of 1 files at r2. Review status: all files reviewed at latest revision, 1 unresolved discussion.

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