Added read-only and prefix filesystem adapter decoration as a config option

[zingimmick]

No description provided.

[codecov]

Codecov Report

Merging #54 (fb82d1f) into master (c9fd4fa) will decrease coverage by 9.52%.
The diff coverage is 86.20%.

❗ Current head fb82d1f differs from pull request most recent head b49b7a6. Consider uploading reports for the commit b49b7a6 to get more accurate results

@@              Coverage Diff              @@
##              master      #54      +/-   ##
=============================================
- Coverage     100.00%   90.47%   -9.53%     
- Complexity         1       12      +11     
=============================================
  Files              1        2       +1     
  Lines             21       42      +21     
=============================================
+ Hits              21       38      +17     
- Misses             0        4       +4     

Impacted Files	Coverage Δ
src/ObsAdapter.php	80.95% <80.95%> (ø)
src/ObsServiceProvider.php	100.00% <100.00%> (ø)

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