enhance compatibility with SeismicHandler

[trichter]

See #37.

[codecov-commenter]

Codecov Report

Merging #38 (5b2bbdb) into master (681d05e) will decrease coverage by 0.12%.
The diff coverage is 78.57%.

❗ Current head 5b2bbdb differs from pull request most recent head 5c9aca8. Consider uploading reports for the commit 5c9aca8 to get more accurate results

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   91.60%   91.47%   -0.13%     
==========================================
  Files          17       17              
  Lines        2191     2194       +3     
==========================================
  Hits         2007     2007              
- Misses        184      187       +3     

Impacted Files	Coverage Δ
rf/rfstream.py	93.16% <78.57%> (-0.72%)	⬇️

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