Add read-indices to ISequenceReader protocol.

[alumi]

Summary

Add read-indices to ISequenceReader protocol, which was defined only for FASTA but not for 2bit.
Also defined an alias function in cljam.io.sequence.

Tests

• lein test :all 🆗

[codecov]

Codecov Report

Merging #109 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   85.24%   85.28%   +0.03%     
==========================================
  Files          61       61              
  Lines        4020     4029       +9     
  Branches      400      400              
==========================================
+ Hits         3427     3436       +9     
  Misses        193      193              
  Partials      400      400

Impacted Files	Coverage Δ
src/cljam/io/protocols.clj	100% <ø> (ø)	⬆️
src/cljam/io/sequence.clj	97.14% <100%> (+0.17%)	⬆️
src/cljam/io/fasta/core.clj	90.74% <100%> (+0.17%)	⬆️
src/cljam/io/twobit/reader.clj	78.62% <100%> (+1.02%)	⬆️

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[totakke]

LGTM

[alumi]

Thanks! 😸