Merge Object.assign calls to a single call over Interval

[mauriciopoppe]

Also update deps to the latest

[codecov]

Codecov Report

Merging #33 (31c4ac7) into master (fce59e3) will increase coverage by 94.78%.
The diff coverage is 87.50%.

@@             Coverage Diff             @@
##           master      #33       +/-   ##
===========================================
+ Coverage        0   94.78%   +94.78%     
===========================================
  Files           0       11       +11     
  Lines           0      671      +671     
  Branches        0      187      +187     
===========================================
+ Hits            0      636      +636     
- Misses          0       35       +35     

Impacted Files	Coverage Δ
src/interval.ts	92.53% <81.25%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/operations/algebra.ts	95.29% <100.00%> (ø)
src/operations/relational.ts	89.13% <100.00%> (ø)
src/operations/misc.ts	90.72% <0.00%> (ø)
src/operations/division.ts	100.00% <0.00%> (ø)
src/round.ts	92.59% <0.00%> (ø)
... and 5 more

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