Add get device information endpoint

[dmulcahey]

Describe what the PR does:
This PR adds the initial device endpoint to the API. The endpoint retrieves device information for a specific device.

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Update README.md with any new documentation.
• Add yourself to AUTHORS.md.

[sourcery-ai]

Sourcery Code Quality Report (beta)

✅  Merging this PR will increase code quality in the affected files by 0.56 out of 10.

Quality metrics	Before	After	Change
Complexity	2.00	1.00	-1.00 🔵
Method Length	72.32	51.64	-20.68 🔵
Quality	8.14	8.70	0.56 🔵

Other metrics	Before	After	Change
Lines	134	182	48

Changed files	Quality Before	Quality After	Quality Change
aioflo/api.py	8.14	8.10	-0.04 🔴
aioflo/device.py		9.70
tests/test_device.py		8.72

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Overall	Recommendation
aioflo/api.py	API._request	9	150.84	5.92	Split out functionality

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it via email or our Gitter!

[codeclimate]

Code Climate has analyzed commit 54ba8ab and detected 0 issues on this pull request.

View more on Code Climate.

[codecov]

Codecov Report

Merging #30 into dev will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         9    +1     
  Lines          148       157    +9     
=========================================
+ Hits           148       157    +9     

Impacted Files	Coverage Δ
aioflo/api.py	100.00% <100.00%> (ø)
aioflo/device.py	100.00% <100.00%> (ø)

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[bachya]

Awesome, thank you!