Use inline in the combinations iterator

[mschauer]

Use inline in the combinations iterator to help with https://github.com/JuliaMath/Combinatorics.jl/pull/73

[codecov[bot]]

Codecov Report

Base: 96.85% // Head: 96.85% // Decreases project coverage by -0.00% :warning:

Coverage data is based on head (e28b311) compared to base (d1b633b). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   96.85%   96.85%   -0.01%     
==========================================
  Files           7        7              
  Lines         700      699       -1     
==========================================
- Hits          678      677       -1     
  Misses         22       22              

Impacted Files	Coverage Δ
src/combinations.jl	85.15% <ø> (-0.12%)	:arrow_down:

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