Add support for poppler's hide-annotations flag

[StaticRocket]

Resolves #17

Adds support for poppler's hide-annotations flag which removes the drawn bounding boxes for links and other annotations.

[Belval]

Thank you for implementing this, do you think you could add a test to ensure that it works?

[StaticRocket]

Yeah, I'll add a test and update the docs tonight.

Could you tell me if raising a not implemented error to inform the user that pdftocario doesn't support the hide annotations arguments is the right call?

[Belval]

Yeah it works for me. There seems to be some effort by the main developers to implement it but in the meantime we can just raise an exception.

[codecov-commenter]

Codecov Report

Merging #199 (db7d8aa) into master (70eeb68) will decrease coverage by 0.59%. The diff coverage is 66.66%.

:exclamation: Current head db7d8aa differs from pull request most recent head 69e9191. Consider uploading reports for the commit 69e9191 to get more accurate results

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
- Coverage   96.27%   95.68%   -0.60%     
==========================================
  Files           5        5              
  Lines         295      301       +6     
==========================================
+ Hits          284      288       +4     
- Misses         11       13       +2     

Impacted Files	Coverage Δ
pdf2image/pdf2image.py	94.75% <66.66%> (-0.76%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 70eeb68...69e9191. Read the comment docs.

[Belval]

I'll test it today or tomorrow and merge it if everything works as expected. Thank you for your contribution!

[Belval]

Thank you for your contribution.