Allow adding picks by date

[anowacki]

• Fix broken write_mseed calls in docs
• Allow picks to be added by absolute time

[codecov[bot]]

Codecov Report

Merging #37 (e68e982) into master (d9a9404) will increase coverage by 0.03%. Report is 2 commits behind head on master. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   73.86%   73.90%   +0.03%     
==========================================
  Files          22       22              
  Lines        1699     1705       +6     
==========================================
+ Hits         1255     1260       +5     
- Misses        444      445       +1     

Files Changed	Coverage Δ
src/traveltimes.jl	95.45% <83.33%> (-1.92%)	:arrow_down:

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