Add id for Annotation update

[lukassup]

Description

Update Annotations to require id for update method.

Have you written tests?

• Yes
• No

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   85.42%   85.42%           
=======================================
  Files          15       15           
  Lines         597      597           
=======================================
  Hits          510      510           
  Misses         87       87

Impacted Files	Coverage Δ
grafana_api/api/annotations.py	95.31% <100%> (ø)	⬆️

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[m0nhawk]

Thank you for the additions! 👍